Process for preparing bifunctional Z-stilbene compounds, new bifunctional Z-stilbene compounds and their use for preparing polymers

摘要

Bifunctional stilbene compounds containing at least one stilbene group having the Z configuration, of the formula …IMAGE… are prepared by reacting compounds of the formula …IMAGE… with an acetylene of the formula… HC IDENTICAL C-R4 (III),… in the presence of a palladium catalyst and of a base at temperatures of 30 to 160 DEG C, converting the resulting compounds in the presence of a base into compounds of the formula …IMAGE… then reacting the compounds of the formula (IV) with compounds of the formula …IMAGE… in the presence of a palladium catalyst and of a base at temperatures of from 30 to 160 DEG C, then reducing the resulting acetylene compounds in the presence of catalysts using hydrogen or using other reducing agents to give Z-stilbene compounds of the formula …IMAGE… and converting the functional groups D and D1 into the above-mentioned functional groups Z and Y of the formula (I) in a known manner… or… reacting the Z-stilbene compounds of the formula (VI) in the case where D and D1 at least stand for one bromine atom, with compounds of the formula… H2C=CHR7 (VII),… in the presence of a palladium catalyst and of a base at temperatures of 30 to 160 DEG C and converting the functional groups D, D1 and D2 into the functional groups Z and Y of the formula (I) in a customary manner… or… reacting the compounds of the formula (IV) with compounds of the formula …IMAGE… in the presence of a palladium catalyst and of a base at temperatures of 30 to 160 DEG C, then reducing the resulting acetylene compounds to corresponding Z-stilbene compounds in the presence of catalysts using hydrogen or using other reducing agents and then converting the functional groups D into the functional groups Z and Y of the formula (I) in a known manner.