PROCESS FOR PREPARING BIS-(4-HYDROXY-3,5-DIBROMO-PHENYL)-SULFONE DERIVATIVES

摘要

A process for the preparation of bis-(4-hydroxy-3,5-dibromophenyl)-sulfone derivatives represented by the following formula:

which comprises converting bis-(4-hydroxy-3,5-dibromophenyl)-sulfone to an allyl ether in the presence of an alkali and, if desired, brominating the obtained bis-(4-allyloxy-3,5-dibromophenyl)-sulfone, wherein bis-(4-hydroxy-3,5-dibromophenyl)-sulfone is allyl-etherified with allyl chloride in the presence of a bromide and/or an iodide, and/or a substance capable of forming a bromide and/or an iodide by reaction with the alkali.