Patent Application
20210207064
The present invention relates to compounds for restoring contaminated soil or water by removing heavy metals and formaldehyde in soil or water.
Today, various harmful substances emitted from urbanization, industrialization, and reckless resource development cause air pollution, soil pollution and water pollution, so that they adversely affect the human body and the environment.
Investigation of soil pollution in the industrial complex conducted by the Ministry of Environment of South Korea in 2012 reported soil and groundwater were contaminated in 34 sites (5%) among 693 sites of 5 industrial complexes, and 13 sites among 34 sites were contaminated with heavy metals such as copper, lead, arsenic, mercury, cadmium, and chromium. It is reported that the concentration of heavy metals in the soils of industrial complexes, industrial areas, urban waste treatment areas and abandoned mines/coal mines areas was several hundred times higher than that of natural soil in general areas.
In recent years, it is reported that heavy metals exceeding the standard are detected in urethane artificial turf installed in the school playgrounds, so the seriousness of the problem is increasing.
Since heavy metals in the soil flow into the groundwater by rainwater, they may cause fatal diseases such as Minamata disease, Itai-itai disease, and cancer, so that it is very important not only to prevent contamination of heavy metals in advance but also to restore contaminated soil.
On the other hand, formaldehyde which is a volatile organic compound, and formalin which is aqueous solution of formaldehyde, are widely used in industries such as preservatives, adhesives for preservative wood and wood products, and silk fabrics. Once formalin flowed into the soil due to carelessness in the manufacturing plant, the treatment is very difficult, causing serious contamination of groundwater as well as soil. For example, the unauthorized discharge of formalin into the Han River by USFK in 2000 shows its seriousness.
Now, since soil contamination and water contamination are out of the natural purification capacity of the ecosystem, it is required to effort to efficiently remove heavy metals and formaldehyde in soil and water.
To solve the above problem, an object of the present invention is to provide compounds for restoring contaminated soil or contaminated water that can effectively remove various heavy metals and formaldehyde in soil or water.
In order to achieve the above object, the present invention provides a composition for restoring contaminated soil or contaminated water for the removal of heavy metals and formaldehyde, comprising at least one selected from the group consisting of trientine or trientine derivative of Formula (1), cyclen or cyclen derivative of Formula (2), cyclam or cyclam derivative of Formula (3) as an active ingredient.
wherein: R1, R2, R3, R4, R5 and R6 is each independently hydrogen, —R7—COOH and salts thereof; R7 is a C1-C5 alkyl group, an unsubstituted or substituted aromatic hydrocarbon group, or an unsubstituted or substituted aromatic 6 membered or 5 membered heterocyclic ring.
The effective ingredient for removing heavy metals and formaldehyde is preferably selected from trientine of Formula (1a), cyclen of Formula (2a), and cyclam of Formula (3a).
The trientine derivative is preferably selected from compounds of Formula (1b) to (1d) or a salt thereof.
wherein: R8, R9 is each independently hydrogen or C1-C4 alkyl; X is oxygen (O), sulfur (S) or nitrogen (N).
The cyclen derivative is preferably selected from compounds of Formula (2b) to (2d) or a salt thereof.
wherein: R8, R9 is each independently hydrogen or C1-C4 alkyl; X is oxygen (O), sulfur(S) or nitrogen (N).
The cyclam derivative is preferably selected from compounds of Formula (3b) to (3d) or a salt thereof.
wherein: R8, R9 is each independently hydrogen or C1-C4 alkyl; X is oxygen (O), sulfur(S) or nitrogen (N).
The compound for restoring contaminated soil or contaminated water according to the present invention effectively removes heavy metals and formaldehyde even in a small amount, and causes no or very low skin irritation or toxicity to human body, so that it can be efficiently used for restoring contaminated soil or contaminated water.
The inventors of the present invention have conducted various studies on heavy metal chelating agents in order to develop compounds capable of effectively removing heavy metals in contaminated soil.
It was confirmed in the present invention that trientine, cyclen, cyclam and derivatives thereof are very excellent in removing heavy metal ions in soil or water, and cause no or low irritation or toxicity to the human body, so that they can be efficiently used for restoring the contaminated soil or contaminated water. In further experiments, it was confirmed that trientine, cyclen, cyclam and derivative thereof are very effective in removing formaldehyde (formalin), which is an environmental hormone and a very toxic substance. In addition, from results of synthesizing and experimenting with novel compounds derived from the above compounds, it was confirmed that the introduction of a carboxy group improves heavy metals removal, while when substituted with an aromatic or heterocycle at the amine position, skin stimulation or toxicity is significantly reduced.
On the other hand, the present invention provides novel trientine derivative of Formula (1), novel cyclen derivative of Formula (2), novel cyclam derivative of Formula (3).
wherein: R1, R2, R3, R4, R5 and R6 is each independently —R7—COOH and salts thereof; R7 is a C2-C5 alkyl group, an unsubstituted or substituted aromatic hydrocarbon group, or an unsubstituted or substituted aromatic 6 membered or 5 membered heterocyclic ring.
The present invention provides a composition for restoring contaminated soil or contaminated water for the removal of heavy metals and formaldehyde, comprising at least one selected from the group consisting of trientine or trientine derivative of Formula (1), cyclen or cyclen derivative of Formula (2), cyclam or cyclam derivative of Formula (3) as an active ingredient.
wherein: R1, R2, R3, R4, R5 and R6 is each independently hydrogen, —R7—COOH and salts thereof; R7 is a C1-C5 alkyl group, an unsubstituted or substituted aromatic hydrocarbon group, or an unsubstituted or substituted aromatic 6 membered or 5 membered heterocyclic ring.
Trientine of the following Formula (1a) is a generic name of Triethylenetetramine (TETA).
Triethylenetetramine dihydrochloride has been shown to participate in the metabolism of copper in mouse experiments (F. W. Sunderman et al., Toxicol. Appl. Pharmacol. 38, 177 (1976)). Triethylenetetramine dihydrochloride is pharmacologically well known as a chelating agent for copper, so is well known as a treatment for Wilson's disease (J. M. Walshe, Prog. Clin. Biol. Res. 34, 271 (1979); R. H. Haslam et al., Dev. Pharmacol Ther. 1, 318 (1980)).
Cyclen of the following Formula (2a) is a generic name of 1,4,7,10-tetraazacyclododecane. It forms a chelate through coordination bond with gadolinium (Gd) and is used for nuclear medical contrast agent.
Cyclam of the following Formula (3a) is a generic name of 1,4,8,11-tetraazacyclotetradecane. It also forms a chelate through coordination bond with gadolinium (Gd) and is used for nuclear medical contrast agent.
Trientine, cyclen and cyclam are pharmaceutically well known for their ability to release copper in the human body via oral or vascular administration methods, or use thereof as a contrast agent, but no studies have been reported for use to restore contaminated soil or water.
The present invention discloses the heavy metals removal ability in contaminated soil and water of trientine, cyclen, and cyclam compounds, and the experimental results of irritation and toxicity to the human body of trientine, cyclen, and cyclam compounds. Trientine, cyclen and cyclam are known to be harmful to the skin in the past, however, it was confirmed from the experiments of the present invention that there is no skin irritation or toxicity, or as low as acceptable in use of an effective amount for removing heavy metals
The compound of the present invention is characterized in that it comprises trientine, cyclen, cyclam or a salt thereof as an active ingredient for removing heavy metals.
On the other hand, it was confirmed that the introduction of a carboxy group at amine position of trientine, cyclen and cyclam improves the ability to remove heavy metals, while the introduction of an aromatic or heterocycle at the amine position significantly reduce skin stimulation or toxicity.
The trientine derivatives, cyclen derivatives and cyclam derivatives according to the present invention are preferably selected from the compounds of the following Formulas (1b) to (3d).
wherein: R8, R9 is each independently hydrogen or C1-C4 alkyl; X is oxygen (O), sulfur(S) or nitrogen (N).
The trientine or trientine derivatives, cyclen or cyclen derivatives, cyclam or cyclam derivatives of the present invention is not limited, but may be used for restoring the soil in an aqueous solution of 0.01 to 5.0 wt %, preferably 0.5 to 2.0 wt %.
The trientine or trientine derivatives, cyclen or cyclen derivatives, cyclam or cyclam derivatives of the present invention may be used in the form of water-soluble salt. The above compounds of the present invention may be used in the form of the hydrochloride salt, the sodium salt, or the potassium salt. The above salts of the present invention can be obtained by known methods for preparing the salts.
The compound for restoring the contaminated soil and contaminated water according to the present invention can be used for the removal of heavy metals such as mercury, lead, cadmium, arsenic, chromium, copper, nickel, zinc, manganese, cobalt, tin, cesium-137, uranium-234, radium-226, iridium-192 and plutonium-238.
In addition, the compound for restoring the contaminated soil and contaminated water according to the present invention may be efficiently used for the removal of formaldehyde (formalin) in soil or water.
Hereinafter, the compound for restoring contaminated soil or contaminated water according to the present invention will be described in detail with reference to the following examples. However, the following examples are only illustrative of the present invention and are not to be construed as limiting the scope of the present invention.
Triethylenetetramine (10.0 g) and acetonitrile (ACN) (400 ml) were added and stirred, and then, K2CO3 (66.1 g) and ethyl bromoacetate (78.8 g) were added, heated, and the mixture was refluxed for 48 hours to complete the reaction. The reaction mixture was cooled to room temperature and filtered, the solid was discarded and the filtrate was concentrated in vacuo. Methylene chloride (MC) (200 ml) and purified water (300 ml) were added to the concentrate, stirred for 30 minutes, and allowed to stand to separate layers. The organic layer was treated with MgSO4, concentrated in vacuo, and then subjected to column purification with MC-methanol. 29.6 g of diethyl 3,6,9,12-tetrakis (2-ethoxy-2-oxoethyl)-3,6,9,12-tetraazatetradecanedioate was obtained (Yield: 64.8%).
1H NMR (CDCl3): 4.16 (q, 8H), 4.14 (q, 4H), 3.57 (s, 8H), 3.44 (s, 4H), 2.85 (t, 4H), 2.78 (t, 4H), 2.74 (s, 4H), 1.27 (t, 12H), 1.26 (t, 6H)
The prepared diethyl 3,6,9,12-tetrakis (2-ethoxy-2-oxoethyl)-3,6,9,12-tetraazatetradecanedioate (29.6 g), NaOH (12.33 g), methanol (180 ml) and purified water (120 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours to complete the reaction. After completion of the reaction, the reaction mixture was cooled to 40° C. and concentrated in vacuo to remove the solvent. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (400 ml). The extracted organic layer was treated with MgSO4. 15.9 g of the title compound was obtained (Yield: 72.3%).
1H NMR (DMSO): 4.57 (s, 8H), 4.55 (s, 4H), 4.22 (s, 12H)
Triethylenetetramine (10.0 g), ethyl 4-bromobenzoate (108.1 g), t-BuONa (46.0 g) and toluene (600 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.8 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (2.0 g) was added, heated, and stirred under reflux to complete the reaction. The reaction mixture was cooled to room temperature, a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated in vacuo, and then subjected to column purification with MC-methanol. 22.9 g of tetraethyl 4,4′,4″,4′″-(((ethane-1,2-diylbis((4-(ethoxycarbonyl)phenyl)azanediyl)) bis(ethane-2,1-diyl))bis(azanetriyl))tetrabenzoate was obtained (Yield: 32.4%)
1H NMR (CDCl3): 7.82 (m, 4H), 7.71 (m, 8H), 7.25 (m, 8H), 6.95 (m, 4H), 4.15 (q, 8H), 4.11 (q, 4H), 3.45˜3.18 (m, 12H), 1.27 (t, 12H), 1.26 (t, 6H)
Tetraethyl 4,4′,4″,4′″-(((ethane-1,2-diylbis((4-(ethoxycarbonyl)phenyl)azanediyl)) bis(ethane-2,1-diyl))bis(azanetriyl))tetrabenzoate (22.9 g), NaOH (6.1 g), methanol (180 ml) and purified water (140 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours to complete the reaction. The reaction mixture was cooled to about 40° C. and concentrated in vacuo to remove the solvent. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (200 ml). The extracted organic layer was treated with MgSO4. 17.0 g of the title compound was obtained (Yield: 89.0%).
1H NMR (DMSO): 7.80 (m, 4H), 7.68 (m, 8H), 7.15 (m, 8H), 6.94 (m, 4H), 3.41˜3.28 (m, 12H)
Triethylenetetramine (10.0 g), ethyl 5-bromonicotinate (108.5 g), t-BuONa (46.0 g) and xylene (600 ml) were added, stirred, and then heated to 35° C., and 50% (t-Bu)3P toluene solution (2.8 g) was added, stirred for about 30 min and then heated to 50° C., Pd(dba)2 (2.0 g) was added, heated under reflux to complete the reaction. The reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and to separate layers. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated diethyl 5,5′-((2-((5-(ethoxycarbonyl)pyridin-3-yl)(2-((5-(ethoxycarbonyl)pyridin-3-yl)(2-((5-(ethoxycarbonyl)pyridin-3-yl)(2-(ethoxycarbonyl)pyridin-4-yl)amino)ethyl)amino)ethyl)amino)ethyl)azanediyl)dinicotinate was obtained (Yield: 27.8%).
1H NMR (CDCl3): 8.92 (d, 4H), 8.85 (d, 2H), 8.45 (d, 4H), 8.43 (d, 2H), 7.89 (d, 4H), 7.76 (d, 2H), 4.23 (q, 8H), 4.15 (q, 4H), 3.42˜3.11 (m, 12H), 1.27 (t, 12H), 1.26 (t, 6H)
Diethyl 5,5′-((2-((5-(ethoxycarbonyl)pyridin-3-yl)(2-((5-(ethoxycarbonyl)pyridin 3-yl)(2-((5-(ethoxycarbonyl)pyridin-3-yl)(2-(ethoxycarbonyl)pyridin-4-yl)amino)ethyl)amino)ethyl)amino)ethyl)azanediyl)dinicotinate (19.8 g), NaOH (5.3 g), methanol (160 ml) and purified water (120 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (160 ml). The extracted organic layer was treated with MgSO4. 13.0 g of the title compound was obtained (Yield: 78.4%).
1H NMR (DMSO): 8.95 (d, 4H), 8.87 (d, 2H), 8.46 (d, 4H), 8.44 (d, 2H), 7.89 (d, 4H), 7.75 (d, 2H), 3.41˜3.11 (m, 12H)
Triethylenetetramine (10.0 g), ethyl 5-bromofuran-2-carboxylate (103.3 g), t-BuONa (46.0 g) and toluene (600 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.8 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (2.0 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 25.3 g of tetraethyl 5,5′,5″,5′″-(((ethane-1,2-diylbis((5-(ethoxycarbonyl)furan-2-yl)azanediyl))bis(ethane-2,1-diyl))bis(azanetriyl))tetrakis(furan-2-carboxylate) was obtained (Yield: 37.9%).
1H NMR (CDCl3): 7.42 (m, 12H), 4.31 (q, 8H), 4.28 (q, 4H), 3.65˜3.15 (m, 12H), 1.27 (t, 12H), 1.25 (t, 6H)
Tetraethyl 5,5′,5″,5′″-(((ethane-1,2-diylbis((5-(ethoxycarbonyl)furan-2-yl)azanediyl))bis (ethane-2,1-diyl))bis(azanetriyl))tetrakis(furan-2-carboxylate) (25.3 g), NaOH (7.2 g), methanol (200 ml) and purified water (150 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (200 ml). The extracted organic layer was treated with MgSO4. 15.0 g of the title compound was obtained (Yield: 71.8%).
1H NMR (DMSO): 7.41 (m, 12H), 3.67˜3.15 (m, 12H)
Cyclen (10.0 g) was dissolved in acetonitrile (400 ml). K2CO3 (40.1 g) and ethyl bromoacetate (42.7 g) were added and reaction mixture was heated under stirring and under reflux for about 40 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and then filtered. A solid phase of the reaction mixture was discarded and the filtrate was concentrated under vacuum. MC (200 ml) and purified water (300 ml) are added to the concentrate and stirred for 30 min, and then an organic layer is separated. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 15.7 g of tetraethyl 2,2′,2″,2′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetate was obtained (Yield: 52.3%).
1H NMR (CDCl3): 4.19 (q, 8H), 3.19 (s, 8H), 2.48 (s, 16H), 1.27 (t, 12H)
Tetraethyl 2,2′,2″,2′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetate (15.7 g), NaOH (5.6 g), methanol (95 ml) and purified water (60 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (200 ml). The extracted organic layer was treated with MgSO4. 9.9 g of the title compound was obtained (Yield: 80.5%).
1H NMR (DMSO): 3.88 (s, 8H), 3.23 (s, 16H)
Cyclen (10.0 g), ethyl 4-bromobenzoate (58.5 g), t-BuONa (27.9 g) and toluene (400 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.4 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (1.7 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 15.8 g of tetraethyl 4,4′,4″,4′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetrabenzoate was obtained (Yield: 35.6%)
1H NMR (CDCl3): 7.81 (d, 8H), 6.98 (d, 8H), 4.15 (q, 8H), 3.48 (s, 16H), 1.25 (t, 12H)
Tetraethyl 4,4′,4″,4′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetrabenzoate (15.8 g), NaOH (3.8 g), methanol (130 ml) and purified water (100 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (130 ml). The extracted organic layer was treated with MgSO4. 11.5 g of the title compound was obtained (Yield: 85.2%).
1H NMR (DMSO): 7.82 (d, 8H), 6.97 (d, 8H), 3.45 (s, 16H)
Cyclen (10.0 g), 5-bromonicotinate (58.7 g), t-BuONa (27.9 g) and xylene (400 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.4 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (1.7 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 17.9 g of tetraethyl 5,5′,5″,5″″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetranicotinate was obtained (Yield: 40.1%)
1H NMR (CDCl3): 8.95 (d, 4H), 8.46 (d, 4H), 7.83 (d, 4H), 4.21 (q, 8H), 3.38 (s, 16H), 1.24 (t, 12H)
Tetraethyl 5,5′,5″,5′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetranicotinate (17.9 g), NaOH (4.3 g), methanol (150 ml) and purified water (110 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (160 ml). The extracted organic layer was treated with MgSO4. 11.6 g of the title compound was obtained (Yield: 75.6%).
1H NMR (DMSO): 8.96 (d, 4H), 8.44 (d, 4H), 7.84 (d, 4H), 3.36 (s, 16H)
Cyclen (10.0 g), ethyl 5-bromofuran-2-carboxylate (56.0 g), t-BuONa (27.9 g) and toluene (400 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.4 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (1.7 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 12.6 g of tetraethyl 5,5′,5″,5′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetrakis(furan-2-carboxylate) was obtained (Yield: 30.0%)
1H NMR (CDCl3): 7.39 (d, 8H), 4.35 (q, 8H), 3.28 (s, 16H), 1.35 (t, 12H)
Tetraethyl 5,5′,5″,5′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetrakis(furan-2-carboxylate) (12.6 g), NaOH (3.2 g), methanol (100 ml) and purified water (75 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (100 ml). The extracted organic layer was treated with MgSO4. 7.9 g of the title compound was obtained (Yield: 73.9%).
1H NMR (DMSO): 7.40 (d, 8H), 3.29 (s, 16H)
Cyclam (10.0 g) was dissolved in acetonitrile (400 ml). K2CO3 (34.5 g) and ethyl bromoacetate (36.7 g) were added and reaction mixture was heated under stirring and under reflux for about 40 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and then filtered. A solid phase of the reaction mixture was discarded and the filtrate was concentrated under vacuum. MC (200 ml) and purified water (300 ml) are added to the concentrate and stirred for 30 min, and then an organic layer is separated. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 15.4 g of tetraethyl 2,2′,2″,2′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetraacetate was obtained (Yield: 56.8%).
1H NMR (CDCl3): 4.12 (q, 8H), 3.36 (s, 8H), 2.69˜2.73 (m, 16H), 1.60 (m, 4H), 1.26 (t, 12H)
Tetraethyl 2,2′,2″,2′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetraacetate (15.4 g), NaOH (5.2 g), methanol (90 ml) and purified water (60 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (200 ml). The extracted organic layer was treated with MgSO4. 9.3 g of the title compound was obtained (Yield: 75.9%).
1H NMR (D2O): 3.51 (s, 8H), 3.14 (s, 8H), 3.07 (t, 8H), 1.85 (q, 4H)
Cyclam (10.0 g), ethyl 4-bromobenzoate (50.3 g), t-BuONa (24.0 g) and toluene (400 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.0 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (1.5 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 12.3 g of tetraethyl 4,4′,4″,4′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetrabenzoate was obtained (Yield: 31.0%)
1H NMR (CDCl3): 7.80 (d, 8H), 6.94 (d, 8H), 4.13 (q, 8H), 2.65-2.71 (m, 16H), 1.65 (m, 4H), 1.26 (t, 12H)
Tetraethyl 4,4′,4″,4′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetrabenzoate (12.3 g), NaOH (2.6 g), methanol (70 ml) and purified water (100 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (100 ml). The extracted organic layer was treated with MgSO4. 8.6 g of the title compound was obtained (Yield: 81.2%).
1H NMR (DMSO): 7.83 (d, 8H), 6.95 (d, 8H), 2.63˜2.73 (m, 16H), 1.62 (m, 4H)
Cyclam (10.0 g), ethyl 5-bromonicotinate (50.3 g), t-BuONa (24.0 g) and xylene (400 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.0 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (1.5 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 11.1 g of tetraethyl 5,5′,5″,5′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetranicotinate was obtained (Yield: 27.8%)
1H NMR (CDCl3): 8.91 (d, 4H), 8.37 (d, 4H), 7.85 (d, 4H), 4.15 (q, 8H), 2.67˜2.64 (m, 16H), 1.71 (m, 4H), 1.24 (t, 12H)
Tetraethyl 5,5′,5″,5′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetranicotinate (11.1 g), NaOH (2.6 g), methanol (90 ml) and purified water (70 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (120 ml). The extracted organic layer was treated with MgSO4. 7.4 g of the title compound was obtained (Yield: 77.6%).
1H NMR (DMSO): 8.93 (d, 4H), 8.38 (d, 4H), 7.85 (d, 4H), 2.67˜2.66 (m, 16H), 1.72 (m, 4H)
Cyclam (10.0 g), ethyl 5-bromofuran-2-carboxylate (48.1 g), t-BuONa (24.0 g) and toluene (400 ml) were added, stirred, and then heated to 35° C. 50% (t-Bu)3P toluene solution (2.0 g) was added, stirred for about 30 min and then heated to 50° C. Pd(dba)2 (1.5 g) was added, heated under reflux. After completion of the reaction, the reaction mixture was cooled to room temperature. a purified water (1000 ml) was added, stirred for 30 min, and then an organic layer is separated. An aqueous layer of the reaction mixture was discarded. The organic layer was treated with MgSO4, concentrated under vacuum, and then subjected to column purification with MC-methanol. 14.1 g of tetraethyl 5,5′,5″,5′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetrakis(furan-2-carboxylate) was obtained (Yield: 37.5%)
1H NMR (CDCl3): 7.40 (d, 8H), 4.23 (q, 8H), 2.65˜2.71 (m, 16H), 1.66 (m, 4H), 1.29 (t, 12H)
Tetraethyl 5,5′,5″,5′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetrakis(furan-2-carboxylate) (14.1 g), NaOH (3.5 g), methanol (110 ml) and purified water (85 ml) were added and the reaction mixture was heated to 55-60° C., stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to about 40° C. and concentrated under vacuum. The solvent was removed. The reaction mixture was adjusted to pH 5-6 with 10% aqueous HCl, stirred for 30 min, and extracted with MC (120 ml). The extracted organic layer was treated with MgSO4. 9.4 g of the title compound was obtained (Yield: 78.1%).
1H NMR (DMSO): 7.41 (d, 8H), 2.69˜2.72 (m, 16H), 1.68 (m, 4H)
(1) Preparation of Soil Contaminated with Heavy Metal
Pb(NO3)2 162.1 mg, Cd(NO3)2 211.2 mg, Zn(NO3)2 292.3 mg, respectively, was added to 1 L distilled water to prepare 100 ppm aqueous solutions of heavy metal, respectively.
After collecting and pulverizing uncontaminated soil, fine particles obtained by using a mesh were mixed with the aqueous heavy metal solution to prepare soil samples contaminated with heavy metals.
(2) Experiment
0.5 g, 1.0 g, and 2.0 g of trientine, cyclen, cyclam and the derivative compounds prepared in Embodiments 1 to 12 were added to 100 ml distilled water to prepare 0.5 wt %, 1.0 wt % and 2.0 wt % of aqueous solutions for restoring soil, respectively. 0.5 wt % of aqueous EDTA (ethylenediaminetetraacetic acid) was prepared as a control.
Each 3 ml of the prepared aqueous solution was added to a soil sample contaminated with heavy metals and mixed for 5 minutes.
50 ml of distilled water was added to the contaminated soil mixed with the aqueous solution for restoring soil, stirred for 20 minutes, and settled for 1 hour, and a supernatant was prepared as a sample solution.
The prepared sample solution was analyzed for the heavy metal component using an Inductively Coupled Plasma Mass Spectrometer (ICP-MS) (Xseries™ 2, Thermo Fisher Scientific, UK).
In ICP-MS, the specific mass-to-charge ratio (m/z) of arsenic (As) is 75, that of cadmium (Cd) is 114, and that of nickel (Ni) is 60. The adsorption rate of heavy metals was calculated in comparison with control according to the following Equation 1, and the test result is shown in Table 1.
Adsorption rate of heavy metals (%)=(Adsorption amount of Embodiment/Adsorption amount of Control)×100 Equation 1
As shown in Table 1, the compounds according to the embodiments of the present invention show that the adsorption rate of arsenic (Pb) is 152 to 232%, the adsorption rate of cadmium (Cd) is 141 to 215% and the adsorption rate of nickel (Ni) is 155 to 267% in comparison with the control. It was confirmed that the adsorption rate of heavy metals significantly increased as the content of the active ingredient increased. This means that the compound for restoring soil according to the present invention has a significantly superior heavy metal removal effect compared to the control.
The contaminated soil around the factory in the industrial complex was collected, pulverized, and meshed to prepare fine particles of soil samples.
Trientine, cyclen, cyclam, and the derivative compounds prepared in Embodiments 1 to 12 were respectively added to distilled water to prepare 1.0 wt % aqueous solutions for restoring soil. 1.0 wt % aqueous solutions of EDTA (ethylenediaminetetraacetic acid) was prepared as a control.
Each 3 ml of aqueous solutions for restoring soil was added to soil samples and mixed for 5 minutes.
50 ml of distilled water was added to the mixture of the contaminated soil and aqueous solution for restoring soil, stirred for 20 minutes, settled for 1 hour, and then the total amount of heavy metals (Cu, Zn, Mn, Ni, Cd) in the aqueous solution of contaminated soil were measured with test kit (WAK-Me™, Kyoritsu Chemical-Check Lab, Japan).
The total amounts of heavy metals were measured by comparing the color of the aqueous solution with the standard color, and the results are shown in Table 2.
(Yellow) 0 ppm 0.2 ppm 0.5 ppm 1.0 ppm 2.0 ppm≤5 ppm (red)
As shown in Table 2, the total amount of heavy metals in the filter of Comparative Example 1 was 2.0 ppm, but the total amount of heavy metals in the filter according to the present invention was 5 ppm or more (≤5). It can be confirmed that the adsorption capacity of heavy metals of the filters according to the present invention is remarkable.
Purified water was added to 35.0% formaldehyde(formalin) solution to prepare a 2.0% diluted solution of formaldehyde. 3 molar equivalents of Trientine, cyclen, cyclam, and derivative compounds of the present invention were added to the diluted solution, and the change of amount of formaldehyde was analyzed by gas chromatography (GC) while stirring at room temperature.
The content of formaldehyde was measured under the following analysis conditions in the initial state, after 30 min and 180 min, the result was shown in Table 3.
<GC Analysis Conditions>
As shown in Table 3, GC analysis shows that the formaldehyde was remarkably reduced by about 40% to 45% in 30 min after the addition of the compounds of the present invention and completely undetected after 180 min. This means that the active ingredient of the present invention adsorbs effectively with formaldehyde, and that the composition of the present invention can be effectively used for removing formaldehyde, which is an environmental hormone and a very toxic substance.
A total of 20 people (10 men and 10 women in their 20 s and 30 s) were tested for skin irritation using the patch method according to the guidelines of CTFA (The Cosmetic, Toiletry & Fragrance Association, Inc. D.C., 20036, 1991).
A filter paper disk was placed in an 8 mm diameter, 10 panels of pin chamber. Then, 20 μl each of the compositions according to Experimental Example 1 was dropped on a filter paper disk, naturally dried for 10 min, and then the pin chambers were attached to the subject's back region with a Scanpor tape.
After 24 hours, the pin chamber was removed, and skin conditions were visually observed. The degree and grade for skin irritation were calculated according to the following Equation 2, and the results are shown in Table 4 below.
[Criteria for Skin Irritation]
(−): No erythema or particularly no symptoms; (±): slightly reddish than the periphery; (+): Apparent reddening than periphery; (++): More reddened and swollen than periphery.
[Grade for Skin Irritation]
Degree of irritation 0-0.1: Grade I (unstimulated);
Degree of irritation 0.11-0.3: Grade II (weakly stimulated);
Degree of irritation 0.31-0.5: Grade III (moderately stimulated);
Degree of irritation 0.51 or more: Grade IV (strongly stimulated)
As shown in Table 4, all of the compounds according to the present invention have grade I, which is a non-stimulating range, within the concentration range of 0.5 wt % in the human skin irritation test. In the concentration range of 1.0 wt %, trientine, cyclen and cyclam have grade II (light stimulus range), whereas all of these aromatic and heterocyclic derivatives have grade I, indicating that skin irritation reduction is improved. On the other hand, The EDTA of Comparative Example 1 was evaluated to be grade III (moderate irritation range) at a concentration of 1.0 wt %, indicating that the skin irritation is higher than those of the compounds of the present invention. Therefore, the compound according to the present invention is harmless to the human body and is environmental-friendly for restoring contaminated soil and contaminated water.
The present invention can be effectively used for restoring contaminated soil or contaminated water by removing heavy metals and formaldehyde contained in soil or water.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2018-0042641 | Apr 2018 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2019/004427 | 4/12/2019 | WO | 00 |
