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- [21] Catalytic asymmetric alkylations of ketoimines.: Enantioselective synthesis of N-Substituted quaternary carbon stereogenic centers by Zr-catalyzed additions of dialkylzinc reagents to aryl-, alkyl-, and trifluoroalkyl-substituted ketoimines JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (16) : 5530 - 5541