Cyclobutanones (1) and cyclobutenones (2), R1 and/or R2 = alkyl, aryl, H, often used as synthetic building blocks, could be prepared from N,N‐dialkylamides, trifluorome‐thanesulfonic acid anhydride and alkenes or alkynes in the presence of collidine. N,N‐Dialkyl‐N‐alkylideneammonium(keteniminium) salts occur as intermediates.
Cyclobutanone (1) und Cyclobutenone (2), R1 und/oder R2 = Alkyl, Aryl, H, häufig verwendete Synthesebausteine, konnten aus N,N‐Dialkylamiden, Trifluormethansulfon‐säureanhydrid und Alkenen bzw. Alkinen in Gegenwart von Collidin hergestellt werden. Als zentrale Zwischenstufe treten N,N‐Dialkyl‐N‐alkylidenammonium(Keteniminium)‐Salze auf.
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