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Cumulated Ylides, IX. New Synthesis of N‐substituted (Triphenylphosphoranylidene)ketenimines and (Triphenylphosphoranylidene)thioketene Methylenetriphenylphosphorane (1) and isocyanidedichlorides resp. thiophosgene react in the molar ratio 3 : 1 to give N‐substituted (triphenylphosphoranylidene)ketenimines 6A resp. (triphenylphosphoranylidene)thioketene 6B and methyltriphenylphosphonium chloride. The P — Cα‐coupling constants in the 13C‐NMR‐spectra of 6 are in agreement with theoretical calculations.
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Bestmann et al. (1980) studied this question.
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