4) indole-3-butyric acid ethyl ester 吲哚丁酸乙酯 1. The chlorination of indole-3-butyric acid ethyl ester with chlorine and using iron powder as catalyst is reported. 以Fe粉为催化剂,用直接通入Cl2的方法对吲哚丁酸乙酯进行氯化,其氯代产物经确证为一未见文献报道的新化合物。