Add time:07/13/2019         Source:sciencedirect.com

Chlorocarbenium salts 2a-d of the Vilsmeier-Arnold type react with the silylated isocyanuric acid 3 to give 1-oxa-3-azabutatrienium salts 1 under mild conditions. From reactions of diarylchloromethenium salts 2h-1 with 3 and ketones or tertiary carboxamides high yields of 2-azaallenium salts 9 were obtained. A few chloro substituted 2-azaallenium salts 5 were prepared from 1b and carbonyl compounds. The mechanisms of the new reactions are discussed.

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