Several recent reports in the literature have demonstrated that hexamethyldisilathiane (HMDST) may be efficiently employed in the formation of thiocarbonyl compounds, including inter alia thioaldehydes, thioketones, thioamides and thio1actams. l Very recently, this thionating agent has been utilized in our laboratory to effect the conversion of aromatic and heteroaromatic o-azidoaldehydes to o-azidothioaldehydes, a new class of reactive ...