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Abstract:
Classical"carbanions" can be titanated to form reagents whichbehave chemo—, regio— and stereoselectively in reactions with alkylhalides and carbonyl compounds. The nature of the ligands at Ti(IV) determines the electronic and steric properties of the reagents. This is usefulin predicting the stereochemical outcome in reactions with alkoxy carbonylcompounds. TiCl4 can also be used for stereoselective C—C bond formation.