Author:
Baron ML,Rae ID,Simmonds PM
Abstract
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.
Cited by
3 articles.
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