实验事实 o 实 川 PCI HOCCH, CHCOH HOCCHCHCOH Ether OH Cl (-)-Malic acid 0 (+)-Chlorosuccinic acid alD=-2.3 O HO Ag2O, H2o 川l l HOCCHCHCOH HOCCH CHCOH Ether c OH (-)-Chlorosuccinic acid (+)-Malic acid (aD=+250实验事实 实验事实： 1. The Walden Inversion OH O O HOCCH2 CHCOH PCl3 Ether C l O O HOCCH2 CHCOH ( - ) - Malic acid [a]D = - 2.30 ( + ) - Chlorosuccinic acid OH O O HOCCH2 CHCOH ( + ) - Malic acid [a]D = + 2.30 C l O O HOCCH2 CHCOH ( - ) - Chlorosuccinic acid Ag2O, H2O Ag2O, H2O PCl3 Ether