Aromatic carboxylic acids, acid halides thereof and processes for preparing both

摘要

A novel aromatic carboxylic acid useful as a material for macromolecular compounds and, in particular, for polycondensed macromolecular compounds exhibiting excellent heat resistance, an acid halide derivative thereof and a process for producing these compounds are disclosed. The aromatic carboxylic acid and the acid halide derivative thereof have structures represented general formulae (1) and (2), respectively, and can be efficiently produced from a dialkyl ester derivative of isophthalic acid and an acetylene derivative in accordance with the disclosed process comprising specific steps. In the above formulae, A represents: -C≡C-R¹ (a) or (R¹ represents hydrogen atom, an alkyl group or an aromatic group, R² represents an alkyl group or an aromatic group) and X represents a halogen atom.