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R2P̈-C̈-X or R2P⊕ C⊖-X or R2PC-X—which form best describes the activity of the title compound 1? On the basis of its reactions with Me3SiCl, Me3SiN3 and DMSO as well as NMR data, 1 was hitherto regarded as a species with PC multibonding. That 1 is rather a carbene, could now be deduced, inter alia, from the addition of electron deficient alkenes (→2) and tert-butyl isocyanide (→3) (R=iPr2N, X = SiMe3).
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Igau et al. (1989) studied this question.
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