外消旋化实例 COH 酸或碱 COH 3 HOH HO--H CH (R)(-)乳酸 (S)-()乳酸 HO OH CH3 OHOrganic Chemistry Organic Chemistry Xiamen Xiamen University University 外消旋化实例 CO 2 H H OH CH 3 CO 2 H HO H CH 3 ( S ) - ( )-乳酸 C C HO OH CH 3 OH (R)-(-)-乳酸 酸或碱