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.
Matevosyan, "Potassium carbonate as a base for generation of carbanions from CH-acids in organic synthesis," Russian Chemical Bulletin, vol.
When treated with sodium ethoxide in ethanol, iso-LSD formed a C-8 carbanion. Addition of water selectively protonated the carbanion to LSD.
Initially, the methyl at 5-position of compound 1 is turned to methylene carbanion A under alkaline condition and produces a H2O molecule.
Technical presentations will include the following: "Stretching the temperature limits of HNBR elastomers," John Dato, Bayer Polymers; "Use of clean paraffinic processing oils to improve properties," Nadine Yenni, ChevronTexaco; "Synthesis of new elastomers using carbanion and free radical chemistries," Thieo E.
The biological activity depends not only on the site of fluorination and the geometry of the conjugate carbanion formed but also on the total electronegativity of new heterocyclic nitrogen systems.
Gibson; "Delocalized carbanion initiators: Controlled routes towards catenated polymers," B.
Moreland, The Synthesis of Alkenes from Carbonyl Compounds and Carbanions a to Silicon Vii.
In this process, carbanions are generated because of the redox reaction.
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.