In the course of a study of p-bromobenzalpyruvic acid,'it became of interest to have for comparison certain derivatives of p-bromocinnamic acid. This acid and several related compounds have, therefore, been prepared. p-Bromocinnamic acid has been obtained previously by the usual methods2 and also by vacuum distillation of brominated truxillic acids3 and, un-expectedly, as a by-product in the Friedel-Crafts reaction with the acid ...
