carbanion


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carbanion

[¦kärb′an‚ī·ən]
(chemistry)
One of the charged fragments which arise on heterolytic cleavage of a covalent bond involving carbon; the fragment carries an unshared pair of electrons and bears a negative charge.
References in periodicals archive ?
We hypothesized that cleavage of the C-P bond would yield the corresponding PFPAs and 1H-PFAs, presumably via protonation of a carbanion leaving group.
The very high reactivity of the carbanions formed, especially when using malonate species as the donor.
Starting from a historical review, the book covers hot topics like Palladium-catalyzed arylation of N-H and alpha-C-H-acidic Bonds, Copper-catalyzed arylation of N-H and O-H Bonds, direct arylation reactions, carbanion aromatic synthesis, arylation reactions of alkenes, alkynes and much more.
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.
This system performs temperature-sensitive reactions including carbohydrate chemistry, the formation of carbanions, and other highly reactive intermediates.
In conjunction with butadiene monomer, such an organolithium based system produces allylic carbanions that are unique in terms of their structure, reactivity and solvency.