MeSi(CH2SnRO)3(R=Ph, Me3SiCH2): Building Blocks for Triangular-Shaped Diorganotin Oxide Macrocycles

The syntheses of the novel silicon-bridgedtris(tetraorganotin) compounds MeSi(CH2SnPh2R)(3)(2, R=Ph;5, R=Me3SiCH2) and their halogen-substituted derivatives MeSi(CH2SnPh(3-n)In)(3)(3,n=1;4,n=2) and MeSi(CH2SnI2R)(3)(6, R=Me3SiCH2) are reported. The reaction of compound4with di-t-butyltin oxide (t-Bu2SnO)(3)gives the oktokaideka-nuclear (18-nuclear) molecular diorganotin oxide [MeSi(CH2SnPhO)(3)](6)(7) while the reaction of6with sodium hydroxide, NaOH, provides the trikonta-nuclear (30-nuclear) molecular diorganotin oxide [MeSi(CH2SnRO)(3)](10)(8, R=Me3SiCH2). Both7and8show belt-like ladder-type macrocyclic structures and are by far the biggest molecular diorganotin oxides reported to date. The compounds have been characterized by elemental analyses, electrospray mass spectrometry (ESI-MS), NMR spectroscopy,H-1 DOSY NMR spectroscopy (7), IR spectroscopy (7,8), and single-crystal X-ray diffraction analysis (2,7,8).