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a) i. (1S)-(+)-10-camphorsulfonic acid, CH3CN/diethylether; ii. 10% NaOH, CH2Cl2. b) Mother liquor from first step taken. i. (1R)-(−)-10-camphorsulfonic acid, CH3CN/diethyl ether; ii. 10% NaOH, CH2Cl2. c) Triphosgen, aquas sat. Na2CO3/CH2Cl2, 0 °C.
