SYNTHESIS OF DIFUNCTIONAL TRIARYLETHANES WITH PENDENT ETHYNYL GROUPS - MONOMERS FOR CROSS-LINKABLE CONDENSATION POLYMERS

Synthetic schemes have been developed and optimized for the preparatio n of groups of 4,4'-diamino- and 4,4'-dihydroxytriarylethanes with an ethynyl group pendent on the third aryl group. Palladium(0)-catalyzed reaction of an aryl halide moiety with an acetylene is used for the at tachment of the ethynyl group. The third aryl group is either a phenyl or a phenoxyphenyl group, while the other end of the ethynyl group is either unprotected or bears an n-butyl or phenyl group. The variation s in the structure of the third aryl group and the cap on its acetylen e group are chosen to probe their influence on the mechanical properti es of the resulting crosslinked thermoplastics.