[CH:1]([S:14]([CH2:16][C:17]([OH:19])=[O:18])=[O:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:20][CH:21]([NH2:28])[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1>>[CH:1]([S:14]([CH2:16][C:17]([O-:19])=[O:18])=[O:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1.[CH3:20][CH:21]([NH2:28])[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1(1°) reacting (±)-benzhydrylsulfinylacetic acid with (-)-α-methylbenzylamine to give the (-)-benzhydrylsulfinylacetate of (-)-α-methylbenzylamine (the reaction advantageously being carried out in the presence of a small excess of amine relative to the stoichiometric conditions, and more particularly with a molar ratio amine/acid of between 1.02/1 and 1/15/1 and preferably of between 1.05/1 and 1.10/1),
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