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Please login to access the full content or check if you have access via Variation 3: Of Keteniminium Salts and Alkenes

DOI: 10.1055/sos-SD-026-00397

Salaün, J.Science of Synthesis, (200526568.

Keteniminium salts, readily available from α-chloro enamines and a Lewis acid,[‌55‌] are highly electrophilic molecules. They undergo [2+2] cycloaddition with nonactivated and even electrophilic alkenes, giving cyclobutaniminium salts, which provide cyclobutanones when hydrolyzed.[‌56‌] They have therefore been used as ketene equivalents in cycloadditions with alkenes; moreover, they have the advantage of not dimerizing.

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