Claims
- 1. A process for preparing a polyhydric phenol compound represented by the formula (1): ##STR6## wherein R.sub.1, R.sub.2 and R.sub.3 independently represent hydrogen atom, alkyl, alkenyl, cycloalkyl, aralkyl or aryl group, which comprises carrying out a condensation reaction between a compound represented by the formula (II): ##STR7## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, and pyrogallol in the presence of ethyl acetate and an organic acid catalyst.
- 2. The process according to claim 1, wherein said organic acid is p-toluenesulfonic acid.
- 3. The process according to claim 1, further comprising neutralizing the reaction mixture after the condensation reaction with an alkali.
- 4. The process according to claim 1, further comprising isolating the polyhydric phenol compound by recrystallization using water.
- 5. The process according to claim 1, wherein said compound represented by formula (II) is an aliphatic ketone.
- 6. The process according to claim 5, wherein said aliphatic ketone is selected from the group consisting of acetone, methyl ethyl ketone and methyl isobutyl ketone.
- 7. The process according to claim 1, wherein said compound represented by formula (II) is selected from the group consisting of methyl cyclohexyl ketone and acetophenone.
- 8. The process according to claim 1, wherein the molar ratio of said compound represented by formula (II) to pyrogallol is from 1:1 to 1:10 in said condensation reaction.
- 9. The process according to claim 1, wherein the molar ratio of said compound represented by formula (II) to pyrogallol is from 1:2 to 1:4 in said condensation reaction.
- 10. The process according to claim 1, wherein said organic acid catalyst is selected from the group consisting of methanesulfonic acid, trichloroacetic acid, trifluoroacetic acid and p-toluenesulfonic acid.
- 11. The process according to claim 1, wherein said organic acid catalyst is used in said condensation reaction in an amount of 0.01 to 1.5 moles per one mole of said compound represented by formula (II).
- 12. The process according to claim 1, wherein said organic solvent is used in said condensation reaction in an amount of 50 to 500 parts by weight per 100 parts by weight of pyrogallol.
- 13. The process according to claim 1, wherein said ethyl acetate is used in said condensation reaction in an amount of 110 to 250 parts by weight per 100 parts by weight of pyrogallol.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-211387 |
Aug 1992 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/093,620 filed on Jul. 20, 1993, now abandoned,.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5436107 |
Tomioka et al. |
Jul 1995 |
|
Foreign Referenced Citations (5)
Number |
Date |
Country |
505987 |
Sep 1992 |
EPX |
55-139375 |
Oct 1980 |
JPX |
61-27980 |
Feb 1986 |
JPX |
4295472 |
Oct 1992 |
JPX |
822659 |
Oct 1959 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
93620 |
Jul 1993 |
|