METHOD FOR PRODUCING 5-CYANOPHTHALIDE, AND METHOD FOR PRODUCING INTERMEDIATE FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method for producing safe 5-cyanophthalide with low environmental load, and to provide a method for producing each of intermediates for the above compound. SOLUTION: This method comprises producing 5-cyanophthalide, without using any toxic reagent, through a 5-halogenomethylphthalide and 5- formylphthalide from 2,4-dimethylbenzoic acid or a lower alkyl ester thereof as starting material.