A high-yield route to 1,2-dihydrocyclobutazene-3,6-dicarboxylic acid

Article abstract of DOI:10.1055/s-1992-26354

A simple five-step method for preparing the previously unknown 1.2-dihydrocyclobutabenzene-3,6-dicarboxylic acid (XTA) in high yield is presented. All intermediates were crystalline compounds which allowed the preparation to be scaled up without complication. The title compound is of interest as a crosslinkable derivative of the widely used monomer, terephthalic acid (TA).