申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:EP0084158A1
公开(公告)日:1983-07-27
A process for the preparation of 4-hydroxy-2,4,6-trimethylcyclohexa- 2,5-diene-1-one from 2,4,6-trimethylphenol is disclosed, comprising reacting 2,4,6-trimethylphenol with an aqueous solution or suspension of hypohalogenous acid or salt thereof in an aqueous medium or mixed medium of water and specific organic solvents. This process enables to prepare 4-hydroxy-2,4,6- trimethyl- cyclohexa-2,5-diene-1-one, which is a precursor for 2,3.5-trimethylhydroquinone, a starting material for the preparation of vitamin E, by a simplified operation, safely and at high yields.
本发明公开了一种由 2,4,6-三甲基苯酚制备 4-羟基-2,4,6-三甲基环己-2,5-二 烯-1-酮的工艺,包括在水介质或水与特定有机溶剂的混合介质中,使 2,4,6-三甲基苯酚与次卤酸或其盐的水溶液或悬浮液反应。 该工艺可以通过简化操作,安全、高产地制备 4-羟基-2,4,6-三甲基-环己-2,5-二烯-1-酮,该物质是制备维生素 E 的起始原料 2,3.5-三甲基对苯二酚的前体。