Synthesis and Structure of 1,2,3,4,5-Tetrathiaplumbo-Lanes, the First Stable Pb-Containing Cyclic Polysulfides

Abstract

The first examples of Pb-containing cyclic tetrasulfides, R(Tip)PbS₄ [4 (R=Tip) and 5 (R=Tbt); Tip=2,4,6-triisopropylphenyl, Tbt=2,4,6-tris[bis(trimethylsilyl)methyl]phenyl], were synthesized and isolated as stable crystalline compounds by the sulfurization of the corresponding overcrowded diarylplumbylenes, Tip₂Pb: (6) and Tbt(Tip)Pb: (10). Molecular structures of 4 and 5 were determined by X-ray crystallographic analysis. Desulfurization reactions of the tetrathiaplumbolanes 4 and 5 leading to the foramtion of plumbanethiones R(Tip)Pb=S, novel lead–sulfur double bond compounds, are also described.