Abstract:The ylides Ph 3 E-C 6 H 6 N 2 O 3 (7, E = P (a), As (b), Sb (c)) have been prepared through the reaction of Ph 3 E and 5-bromo-1,3-dimethyl-2,4,6(1H,3H,5H)-pyrimidinetrione (5-bromo-1,3-dimethylbarbituric acid) 6 in the presence of triethylamine. Their characterisation was performed by nuclear magnetic resonance (NMR), mass spectrometry (MS) and elemental analysis.