Dehydrohalogenation-rearrangement of 1,1-bis(4-oxy-substituted aryl)-2-haloethanes to yield 4,4'-dioxysubstituted stilbenes is effected by heating an acidic reaction medium comprising the 1,1-bis(4-oxy-substituted aryl)-2-haloethane dissolved in a solution of an aliphatic carboxylic acid and a carboxylic acid salt. The process is particularly directed to the preparation of 4,4'-dihydroxystilbene from 1,1-bis(4-hydroxyphenyl)-2-chloroethane.
将1,1-双(4-氧基取代芳基)-2-卤代
乙烷进行脱卤-重排反应,得到4,4'-二氧基取代的
苯乙烯,方法是在酸性反应介质中加热,该介质含有1,1-双(4-氧基取代芳基)-2-卤代
乙烷、脂肪族
羧酸和
羧酸盐的溶液。该方法特别适用于从1,1-双(
4-羟基苯基)-2-
氯乙烷制备4,4'-二羟基
苯乙烯。