Abstract
The structures of the addition products of heptamethylsilagermazane and heptamethylsilastannazane with isocyanates or isothiocyanates have been elucidated spectroscopically. The substituents on the heterocumulenes, the migratory aptitudes of the Me 3M groups (Me 3Si > Me 3Ge > Me 3Sn), and the affinity of each metal for the nitrogen, oxygen, or sulphur atom determines which of the possible isomeric structures is favoured in each case.
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