New insights in asymmetric tetraorganodistannoxane ladder formation. A NMR-spectroscopic and crystallographic study
journal contribution
posted on 2001-01-01, 00:00 authored by J Beckmann, K Jurkschat, S Rabe, M Schurmann, Dainis DakternieksThe syntheses of the asymmetrically substituted tetraorganodistannoxanes [<i>t</i>-Bu<sub>2</sub>(X)SnOSn(Y)(CH<sub>2</sub>SiMe<sub>3</sub>)<sub>2</sub>1<sub>2 </sub>(<b>1</b>, X = Y = OH; <b>2</b>, X = Cl, Y = OH; <b>3</b>, X = Y = Cl) are reported and their structures in solution and in the solid state are characterized by multinuclear NMR spectroscopy and single crystal X-ray analyses. In toluene, the tetrahydroxy-substituted derivative <b>1</b> is in equilibrium with the organotin oxides <i>cyclo</i>-[<i>t</i>-Bu<sub>2</sub>Sn{OSn(CH<sub>2</sub>SiMe<sub>3</sub>)<sub>2</sub>}<sub>2</sub>O] (<b>4</b>), <i>cyclo</i>[(Me<sub>3</sub>SiCH<sub>2</sub>)<sub>2</sub>Sn(OSn<i>t</i>-Bu<sub>2</sub>)<sub>2</sub>O] (<b>5</b>), and <i>cyclo</i>-(<i>t</i>-Bu<sub>2</sub>SnO)<sub>3</sub>, and some additional, undefined species containing pentacoordinated tin atoms. In contrast, the dihydroxydichloro-substituted derivative <b>2</b> is inert in solution.<br>
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