
%0 Journal Article
%A Baron, ML 
%A Rae, ID 
%A Simmonds, PM 
%T The reaction of piperazine-2,5-dione with 2-formylbenzoic acid.
%J Australian Journal of Chemistry
%D 1982/12/01
%V 35
%N 12
%P 2567-2569
%K 
%R https://doi.org/10.1071/CH9822567
%U https://www.publish.csiro.au/paper/CH9822567 
%X Reaction of piperazine-2,5-dione with 2-formylbenzoic acid in the presence of triethylamine gives three products: 1-(3'-oxo-1',3'-dihydroisobenzofuran-1'-yl)piperazine-2,5-dione, its 1,4-bis analogue which had previously been identified as the 3,6-compound, and 2,2'-[3,6-dioxopiperazine-2,5-diylidenebis(methylidyne)]bis(benzoic acid). The latter compound is shown by 1H and 13C n.m.r, spectroscopy to be the Z,Z isomer. 
