Polyimides made by reacting 1,2-acetylene-4,4'-di(phthalic anhydride) with an aromatic diamine are useful in high temperature applications that require solvent resistance. Applications include components of combustion engines.
Symmetrical diaryl-acetylenes can be prepared by reacting an aryl halide with acetylene in the presence of a palladium catalyst and a base. If the acetylene is introduced into the liquid reaction mixture using a high intensity gas dispersion means, the aryl halide used can be an aryl bromide.
