Abstract
Tin-119 and carbon-13 NMR data for a total of 34 compounds containing the grouping Sn-C-Sn (C is either sp 3- or sp 2-hybridised) are presented and discussed. In organotin derivatives of alkanes, 2 J(Sn-C-Sn) can only be correlated with 1 J(Sn-C 2) if a sign change for the former coupling is assumed. In most of the compounds of this type studied, 1 J(Sn- CH 3) is, due to rehybridisation and in contrast to the usual situation, larger than 1 J(Sn-C 2); the same is true in some cases for distannylakenes, the behaviour of which is complicated by changes in the torsional angle about the carbon-carbon double bond. Thus correlation of 2 J(Sn-C-Sn) with other spectral parameters is not possible in these cases. The total tin chemical shift range for compounds Me n Sn(CH 2MME 3) 4- n (M C, Si, Ge, Sn; n 0–4) is 140 ppm. Incorporation of a ditin fragment in a six-membered ring causes a downfield tin shift of 30 ppm.
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