The reactions of isothiocyanates and thiocyanates with methylniobium(V) chlorides and methyltantalum(V) chlorides

Abstract

The reactions of Me x MCl 5− x , x = 1,2,3, M = Nb, Ta with RNCS, R = Me, Ph have been studied, and products of the types MCl 4 [NRC(S)Me], MeTaCl 3[NRC(S)Me] and NbCl 3[NMeC(S)Me] 2 containing thioacetamide groups, arising from insertion into the metalcarbon bonds have been characterised. Reactions with MeSCN yield the complexes MeMCl 4 · MeSCN and Me 2MCl 3 · MeSCN; the presence of S- and N-bonded isomers is indicated by the infrared spectra.