立体化学 CH LCH3 Ch3CO3H C-C H O CHa"CCCH3 Ch3CO2H 顺式加成立体专一性反应Organic Chemistry Organic Chemistry Xiamen Xiamen University University 立体化学 C C H H CH3 CH3 CH3CO3 H C C H H CH3 CH3 O + CH 3CO 2 H 顺式加成 立体专一性反 应