Spectroscopic Studies On Some Methylphosphonothioic Diamides And Related Compounds

Abstract

A series of methylphosphonothioic diamides MrP (S) (NHR)., ( R = Mr, pr' and Bu') and some related compounds viz, PhP(S)(NHBu)a ,P1^P(S) ( NHCHJ'h ) arc preparpd and their infrared, n.m.r. and mass spectra arc- recorded. The V(P=S), M(P—C) and V(P—N) values are determined in each case and indicate very little effect of the substituents on these bond vibrations. On the bases of 'H, ^C and ^P n.m.r. spectroscopic data it was shown that the spectra of all diamides agree with the expected structures with the exception ofPr' and Bu' diamides where the 'H and ^C n.m.r. of the methyl groups of the Pr' or Bu' groups showed nonequivaleiicc.