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Scope of phosphetane catalyzed Cadogan cyclizations
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Yields shown are for pure isolated material. Products 8–13 were conducted on 0.5 mmol scale (15 mol% 2, 100 °C, 1 M toluene) and 14–19 were conducted on 1-gram scale (20 mol% 2, 120 °C, 1 M butyl acetate). 2 equiv of phenylsilane in all reactions.
