Claims
- 1. In a process for the preparation of a carbonate by contacting a glycol carbonate of a 1,2-diol with 2 to 4 carbon atoms with an alcohol selected from the group consisting of methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, allyl alcohol, cyclohexanol, ethylhexanol, benzyl alcohol and methyl-glycol to form the corresponding carbonate of said alcohol at a temperature between 50.degree. and 250.degree. C. in the presence of a catalyst, the improvement wherein a thallium compound is employed as catalyst which thallium compound is selected from the group consisting of thallium-I oxide, thallium-III oxide, thallium-I hydroxide, thallium-I carbonate, thallium-I acetate, thallium-III acetate, thallium-I bromide, thallium-I chloride, thallium-III chloride, thallium-I fluoride, thallium-I formate, thallium-I nitrate, thallium-I cyanate, thallium-I stearate, thallium-I naphthenate, thallium benzoate, thallium cyclohexylphosphonate, thallium-I hexahydrobenzoate, cyclopentadienylthallium, thallium methylate and thallium ethylate.
- 2. A process according to claim 1 wherein the reaction is carried out at a temperature in the range of from 60.degree. to 220.degree. C.
- 3. A process according to claim 1 wherein 0.0001 to 10 percent by weight thallium compound, based upon the weight of the reaction mixture, is employed.
- 4. A process according to claim 1 wherein 0.001 to 1 percent by weight of thallium compound, based upon the weight of the reaction mixture, is employed.
- 5. A process according to claim 1 wherein between 1 and 10 mols excess alcohol are employed per mol of glycol carbonate.
- 6. A process according to claim 1 wherein the thallium compound is thallium-I oxide, thallium-I hydroxide, thallium-I carbonate, thallium-I acetate, thallium-III acetate, thallium-I fluoride, thallium-I formate, thallium-I nitrate, thallium-I naphthenate or thallium methylate.
- 7. A process according to claim 1 wherein the carbonate is butylene glycol carbonate, vinyl ethylene glycol carbonate, chloromethyl ethylene glycol carbonate, ethylene glycol carbonate or propylene glycol carbonate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2740251 |
Sep 1977 |
DEX |
|
Parent Case Info
This is a continuation of application Ser. No. 938,185 filed Aug. 30, 1978, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2107084 |
Sep 1972 |
DEX |
2637409 |
Mar 1977 |
DEX |
Non-Patent Literature Citations (3)
Entry |
H. Zondler et al., Chem. Abstracts 85: 108507q (1976). |
K. Chimura et al., Chem. Abstracts 78:97345n (1973). |
H. Zondler et al., Helv. Chim. Acta, vol. 60, 6 (1977), Nr. 181, pp. 1845 et seq. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
938185 |
Aug 1978 |
|