Stannyl-substituted Disilenes and a Disilastannirane

The reaction of disilenide Tip(2)Si=Si(Tip)Li (1, Tip = 2,4,6-iPr(3)C(6)H(2)) with chlorostannanes R3SnCl quantitatively affords the first stannyl-substituted disilenes TiP2Si=Si(Tip)SnR3 (2a: R = Me, 2b: R = Bu, 2c: R = Ph). The Sn-functional derivative TiP2Si=Si(Tip)Sn/Bu2Cl (3) is accessible in good yield from 1 and tBu(2)SnCl(2). Additionally, the first heavy analogue of cyclopropanes containing two endocyclic silicon and one tin atom was prepared from 1 and Me2SnCl2. All new compounds were characterised by multinuclear NMR spectroscopy and the thus deduced structural assignments corroborated by single-crystal X-ray diffraction.