Carbanions VSEPR predictions

The preferred geometries of carbenium ions and carbanions are correctly predicted by the valence shell electron pair repulsion (VSEPR) theory. The theory is general and can be applied to organic and inorganic compounds, regardless of charge. 

The most stable structures of alkyl and alkenyl anions predicted with the VSEPR theory are supported by reliable calculations. There are no known experimental structural data, due to the fact that counterions occur with formally carbanionic species and they generally experience some type of bonding with the carbanionic carbon. However, you can often approximate both structure and reactivity by assuming that such spieces (e. g., organolithiums) are carbanions. 

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