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Carbene−Pnictinidene Adducts
The syntheses, characterizations, and X-ray crystallographic structure determinations are described for adducts of stable nucleophilic carbenes with pnictinidenes. The adducts between 1,3-dimesitylimidazol-2-ylidene and phenylphosphinidene, phenylarsinidene, (trifluoromethyl)phosphinidene, and (pent...
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Published in: | Inorganic chemistry 1997-05, Vol.36 (10), p.2151-2158 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The syntheses, characterizations, and X-ray crystallographic structure determinations are described for adducts of stable nucleophilic carbenes with pnictinidenes. The adducts between 1,3-dimesitylimidazol-2-ylidene and phenylphosphinidene, phenylarsinidene, (trifluoromethyl)phosphinidene, and (pentafluorophenyl)arsinidene are reported. These carbene−pnictinidene adducts are formed by the direct reaction of a stable nucleophilic carbene with the corresponding pnictinidene cyclic oligomers. The synthesis and structure of the adduct between 1,3-dimesitylimidazolin-2-ylidene and phenylphosphinidene from the reaction of 1,3-dimesitylimidazolin-2-ylidene with phenylphosphorus dichloride are also reported. These carbene−pnictinidene adducts possess strongly polarized pnictinidene−carbene bonds. The C−Pn−C angles are all typically small at 97−102°, and there is only a 4% shortening of the nominal PnC double bond compared to the Pn−C single bond to the second substituent on the pnictogen. The 31P NMR shifts of the phosphorus adducts suggest strongly shielded phosphorus centers in accord with the polarized structures. |
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ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/ic970174q |