MeSi(CH SnRO) (R=Ph, Me SiCH ): Building Blocks for Triangular-Shaped Diorganotin Oxide Macrocycles.

The syntheses of the novel silicon-bridged tris(tetraorganotin) compounds MeSi(CH SnPh R) (2, R=Ph; 5, R=Me SiCH ) and their halogen-substituted derivatives MeSi(CH SnPh I ) (3, n=1; 4, n=2) and MeSi(CH SnI R) (6, R=Me SiCH ) are reported. The reaction of compound 4 with di-t-butyltin oxide (t-Bu SnO) gives the oktokaideka-nuclear (18-nuclear) molecular diorganotin oxide [MeSi(CH SnPhO) ] (7) while the reaction of 6 with sodium hydroxide, NaOH, provides the trikonta-nuclear (30-nuclear) molecular diorganotin oxide [MeSi(CH SnRO) ] (8, R=Me SiCH ). Both 7 and 8 show 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 DOSY NMR spectroscopy (7), IR spectroscopy (7, 8), and single-crystal X-ray diffraction analysis (2, 7, 8).