COOH 2 3-溴环己烷羧酸 4 Br 3-Bromocyclohexanecarboxylic acid COOH 2 1-环戊烯羧酸 o 1- Cvclopentenecarboxylic acidOrganic Chemistry Organic Chemistry Xiamen Xiamen University University COOH Br 1 2 3 4 5 6 3-Bromoc yclohexanecarbox ylic acid 3-溴环己烷羧酸 1-环戊烯羧酸 COOH 1 2 4 3 5 1-C yclo pentenecarbox ylic acid