申请人:The Dow Chemical Company
公开号:US04978809A1
公开(公告)日:1990-12-18
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) and o,o-dialkylphenol having hydrogen on the aromatic ring position which is para to the phenolic hydroxyl under alkylation conditions.
通过在烷基化条件下将(1)具有芳香环上至少一个卤素取代物和至少一个卤甲基取代物的取代酚与(2)芳香环位置在酚羟基对位或邻位具有氢的o,o-二烷基酚接触,制备出具有热稳定性的亚甲基桥联聚酚,例如2,4-双(4-羟基-3,5-二甲基)-3,5-二溴-6-甲基苯酚。