Preparation of 6-bromo-2,2-dialkyl-2,3-dihydrobenzofurans which are optionally fluoro-substituted

摘要

A process for the preparation of a 2,3-dihydrobenzofuran I <IMAGE> I or a derivative thereof, where Ra and Rb are C-organic radicals, involves reacting a 2-hydroxybenzyl alcohol II <IMAGE> II in the presence of an acidic ion exchanger resin and in the presence of an inert dehydrating substance. Novel 2,3-dihydrobenzofurans Ia, 2-acylphenols IVa and 2-hydroxybenzyl alcohols IIa, a process for their preparation, and their use as intermediates are also described.