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. [1] The carbanion exists in a trigonal pyramidal geometry. Formally, a carbanion is …

A benzylic carbocation is a resonance-stabilized carbocation in each of the two equally stable major resonance forms of which the formal charge of +1 is on a benzylic carbon. eg: The lightest benzylic carbocation 1 is called the benzyl carbocation. see also primary benzylic carbocation, secondary benzylic carbocation, tertiary benzylic carbocation

A carbanion is one of several reactive intermediates in organic chemistry. In organic synthesis, organolithium reagents and Grignard reagents are commonly treated and referred to as "carbanions."

2012年6月20日 · Benzylic functionalization is a convenient approach towards the conversion of readily available aromatic hydrocarbon feedstocks into more useful molecules. However, the formation of carbanionic benzyl species from benzyl halides or similar precursors is far from trivial.

A benzylic carbocation is a resonance-stabilized carbocation in each of the two equally stable major resonance forms of which the formal charge of +1 is on a benzylic carbon.eg: The lightest benzylic carbocation 1 is called the benzyl carbocation. see also primary benzylic carbocation, secondary benzylic carbocation, tertiary benzylic carbocation.

We conclude from this result that proton abstraction from toluene occurs to give benzyl carbanions which are capable of forming new polymer molecules in a chain transfer reaction. [Pg.82] The benzyl carbanion has been found to be most stable because of the extensive delocalization of the negative charge over the various resonating structures ...

2012年7月7日 · In this paper, we report the generation and C-C bond-forming reactions of highly reactive benzyl anion equivalents from styrenes using a one-pot Cu-catalyzed hydroboration followed by simple treatment with KO t Bu and a heterocumulene electrophile.

Electron-donating groups, such as alkyl groups, stabilize the carbanion by dispersing the negative charge. On the other hand, electron-withdrawing groups, such as halogens or carbonyl groups, destabilize the carbanion by withdrawing electron density from the carbon atom.

1972年1月1日 · The formation of a carbanion is energetically more favored in aqueous solution than in the gas phase; in organic solvents of lower polarity than water, the enthalpy change for carbanion formation is more positive than in water itself.

Carbanion, any member of a class of organic compounds in which a negative electrical charge is located predominantly on a carbon atom. Carbanions are formally derived from neutral organic molecules by removal of positively charged atoms or groups of atoms, and they are important chiefly as chemical