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Mechanistic experiments. a) Deuterium incorporation in asymmetric hydrogenation (AH) of (E)-2d. b) Kinetic isotope effects in AH of (E)-2a. c) AH of isomerized compounds 4a. AH of (R)-4a and (S)-4a affords (S,S)-3a and (R,R)-3a as the minor diastereomer, respectively.
