carbanion

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Related to carbanions: Carbenes, Free radicals

car·ban·i·on

 (kär-băn′ī′ən, -ī′ŏn′)
n.
An anion in which carbon carries a negative charge and an unshared pair of electrons.

carbanion

(kɑːˈbænaɪən)
n
(Chemistry) a negatively charged organic ion in which most of the negative charge is localized on a carbon atom. Compare carbonium ion
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The very high reactivity of the carbanions formed, especially when using malonate species as the donor.
Moreland, The Synthesis of Alkenes from Carbonyl Compounds and Carbanions a to Silicon Vii.
After setting out principles and practice, they cover the photogeneration of carbon-centered radicals, heteroatom-centered radicals, biradicals and radical pairs, radical ions, carbocations and carbanions, and cargenes and nitrenes.
In a number of synthetic processes, acidic hydrogen from weak organic acids namely alpha hydrogen adjacent carbonyl group quite often removed by base to generate, carbanions or nitride ion which can then be reacted further as a nucleophile to synthesize many industrially important intermediates & products.
This issue covers reactions of aldehydes and ketones and their derivatives; reactions of carboxylic, phosphoric and sulfonic acids and their derivatives; oxidation and reduction; carbenes and nitrenes; nucleophilic and electrophilic aromatic substitution; carbocations; nucleophilic aliphatic substitution; carbanions and electrophilic aliphatic substitution; elimination reaction; addition reactions (polar addition and cycloaddition); and molecular rearrangements.