Tetraorganodistannoxanes: formation of a novel cis-ladder†

Abstract

Reaction of the acetylenic-bridged ditin precursor [Me₃-SiCH₂(Cl₂)SnCH₂(Me₂)Si]₂C₂ 1 with the oxygen source (Bu^t₂SnO)₃ results exclusively in formation of the dimeric tetraorganodistannoxane {[Me₃SiCH₂(Cl)SnCH₂(Me₂)SiCCSi(Me₂)CH₂Sn(Cl)CH₂SiMe₃]O}₂ 2 which has the hitherto unknown cis-configuration; this is retained during the quantitative conversion of 2 into the hydroxy-substituted analogue {[Me₃SiCH₂(OH)SnCH₂(Me₂)SiCCSi(Me₂)-CH₂Sn(Cl)CH₂SiMe₃]O}₂ 3.