Process for preparation of asymmetrical bisphenols

摘要

Asymmetrical bisphenols such as 2-(3-hydroxyphenyl)-2-(4-hydroxyphenyl)propane are prepared by an improved process wherein a hydroxyphenyldialkylcarbinol is reacted with a phenol in the presence of a hydrogen halide catalyst. According to the improved process, the carbinol is added to a mixture of the phenol and hydrogen halide under conditions maintaining a low carbinol concentration in the reaction mixture. This low concentration is preferably maintained by adding the carbinol in the form of a solution in a portion of the phenol.