Abstract

The reaction of N-methyl- N-trimethylsilylthiobenzamide with diphenylketene or toluenesulfonyl isocyanate does not lead to an insertion product as expected, but to a six-membered heterocyclic compound. Heterocumulenes attack the thiocarbonyl group, which may be due to the presence of the neighbouring trimethylsilyl group. The structures of the products have been determined by spectroscopy.

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