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New Chiral Ligands with Nonstereogenic Chirotopic Centers for Asymmetric Synthesis.

Pseudo-C2 -symmetrical ligands have been prepared efficiently: The attachment of the chiral alkyl group to the heteroatom (P or N) through a nonstereogenic, chirotopic carbon center facilitates their synthesis as the configuration at this carbon atom no longer needs to be controlled. Two such ligands were combined, for example, in the base 1, which is especially useful for asymmetric deprotonation of prochiral ketones [Eq. (a)].