# US 5,710,346 A · 2,2-bis(3,5-disubstituted-4-hydroxyphenyl) propane derivative, process for production thereof, and process for producing pyrogallol using said derivative

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- Number: US 5,710,346 A
- Document ID: US5710346A
- Status: Granted
- Kind: A
- Application number: 08/454,157
- Filed: 1995-06-15
- Granted: 1998-01-20
- Earliest claimed: 1993-10-22
- Assignees: Ihara Chemical Industry Co., Ltd.
- Inventors: Masakazu Takahashi; Tomonori Miyazaki; Chika Maejima; Yoshikazu Kimura
- Web page: https://patentgrep.com/patent/US5710346A

## CPC

- C07C 43/23: containing hydroxy or O-metal groups
- C07C 37/055: the substituted group being bound to oxygen, e.g. ether group
- C07C 37/52: by splitting polyaromatic compounds, e.g. polyphenolalkanes
- C07C 41/16: by reaction of esters of mineral or organic acids with hydroxy or O-metal groups
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The present invention provides a 2,2-bis(3,5-disubstituted-4-hydroxyphenyl) propane derivative represented by general formula (1) ##STR1## wherein each R.sup.1 represents a hydrogen atom or a lower alkyl group; a process for producing such propane derivative; and a process for producing pyrogallol using such propane derivative. The compound of the present invention has by itself a periphyton-controlling activity required for the active ingredient used in a periphyton-controlling agent such as antifouling paint for ship's bottom, antifouling agent for fishing net, or the like. Further, by decomposing the above compound with an alkali or an acid, pyrogallol can be produced industrially without using any natural material.

## Claims

### Claim 1

A 2,2-bis (3,5-disubstituted-4-hydroxyphenyl)propane derivative represented by formula (1) ##STR5## wherein each R.sup.1 represents a hydrogen atom.

### Claim 2

A process for producing a 2,2-bis›3,5-di(lower alkoxy)-4-hydroxyphenyl!propane derivative, which is characterized by reacting a 2,2-bis(3,5-dihalogeno-4-hydroxyphenyl) propane derivative represented by formula (2) ##STR6## wherein each X represents a halogen atom, with a metal alkoxide represented by formula (3)
(R.sup.2 O)nM (3)
wherein each R.sup.2 represents a lower alkyl group, M represents an alkali metal or an alkaline earth metal, and n represents an integer of 1 or 2.

### Claim 3

A process for producing 2,2-bis(3,4,5 -trihydroxyphenyl)propane, which is characterized by dealkylating a 2,2-bis›3,5-di(lower alkoxy)-4-hydroxyphenyl!propane derivative.

### Claim 4

A process for producing pyrogallol, which is characterized by decomposing, with an alkali or an acid, a 2,2-bis(3,5-disubstituted-4-hydroxyphenyl)propane derivative represented by formula (1) ##STR7## wherein each R.sup.1 represents a hydrogen atom or a lower alkylgroup.