The carbene‐like compounds 1, which are formed almost quantitatively from phosphanyldiazomethanes already at T ≤ 35°C if the tetramethylpiperidine(tmp)‐R residue is one of the substituents on the phosphorus, are stable for several weeks in solution. With the exception of 1a, the compounds 1 react with BuNC to give the ketenimines 2. a, R NiPr2, R′ Me; b, R NMe2, R′ Me; c, R NMe2, R′ iPr; d, R Ph, R′ Me. equation image
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Gillette et al. (1990) studied this question.
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