
%0 Journal Article
%A Clark-Lewis, JW 
%A Aldous, GL 
%A Thompson, MJ 
%T 1,1',3,3'-Tetramethyl-5-(4-methylamino-3-nitrobenzyl)-5,5'-methylenebisbarbituric acid
%J Australian Journal of Chemistry
%D 1976/10/01
%V 29
%N 10
%P 2219-2223
%K 
%R https://doi.org/10.1071/CH9762219
%U https://www.publish.csiro.au/paper/CH9762219 
%X The previously proposed structure (2) for the compound named in the title is confirmed by spectroscopic methods and by synthesis of related compounds. The barbituric acid undergoes a very facile thermal fragmentation in the mass spectrometer into 1,3-dimethyl-5-(4-ethylamino-3-nitrobenzy1)-barbituric acid (3) (which was also prepared by unambiguous synthesis) and 1,3-dimethyl-5-methylenebarbituric acid (4). The electron-impact, chemical-ionization, and negative-ion mass spectrometric behaviour of the barbituric acid (2) was examined. 
