Stable N-Heterocyclic Carbenes: N-Alkyl-N'-phosphanylbenzimidazol-2-ylidenes

[摘要]：Three original approaches to the synthesis of N-alkyl-N'-phosphanylbenzimidazolium salts, which are precursors of the corresponding carbenes, were developed. New stable N-alkyl-N'-phosphanylbenzimidazol-2-ylidenes were prepared in good yields. X-ray analysis of a carbene was made and the chemical properties of the carbenes were studied. The reactions with O-, N-, and C-nucleophiles were found to proceed with or without cleavage of the PN bond. Thermal rearrangement of the carbenes afforded 2-phosphorylated benzimidazoles.

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