Science Fair Project Encyclopedia
A carbanion is an anion in which carbon has an unshared pair of electrons and bears a negative charge usually with three substituents for a total of eight valence electrons. The carbanion exists in a trigonal planar geometry. Formally a carbocation is the conjugate base of a carbon acid
R3C-H + B → R3C- + H-B
where B stands for the base.
A Carbanion is a nucleophile. The stability and reativity of a carbanion is determined by the inductive effect .
A carbanion is a reactive intermediate and is encountered in organic chemistry for instance in a elimination reaction and in organometallic chemistry in for instance a Grignard reaction or in alkyl lithium chemistry.
 The isolation and x-ray structures of lithium crown ether salts of the free phenyl carbanions [CHPh2]- and [CPh3]- Marilyn M. Olmstead, Philip P. Power; J. Am. Chem. Soc.; 1985; 107(7); 2174-2175.
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