申请人:THE DOW CHEMICAL COMPANY
公开号:EP0427959A2
公开(公告)日:1991-05-22
Thermally stable methylene-bridged polyphenols such as 2,4-bis(4-hydroxy-3,5-dimethyl)-3,5-dibromo-6-methylphenol are prepared by contacting (1) a substituted phenol having at least one halogen substituted on the aromatic ring in a position meta to the phenolic hydroxyl and at least one halomethyl group substituted on the aromatic ring in a position ortho or para to the phenolic hydroxyl with (2) an o,o-dialkylphenol having hydrogen on the aromatic ring position which is para to the phenolic hydroxyl under alkylation conditions.
热稳定的亚甲基桥联多酚,如 2,4-双(4-羟基-3,5-二甲基)-3,5-二溴-6-甲基苯酚,是通过将(1)芳环上至少有一个卤素取代酚羟基的偏位和芳环上至少有一个卤甲基取代酚羟基的正位或对位的取代苯酚与(2)邻、(2) 在烷基化条件下,在与酚羟基对位的芳环位置上具有氢的邻,邻二烷基酚。