PURPOSE:To obtain an acid ester, etc. having one more carbon atoms safely without forming side chains, by reacting a trialkylsilyldiazomethane with a carboxylic acid chloride, and reacting the resultant intermediate with an amino or phenol. CONSTITUTION:A trialkylsilyl diazomethane expressed by the formula R30SiCHN2 (R30 are 1-4C alkyl), e.g. trimethylsilyldiazomethane, is reacted with a carboxylic acid chloride expressed by the formula RCOC1 (R is alkyl, aryl, etc.) to give an intermediate product, which is then reacted with an amine, e.g. aniline, or phenol, e.g. cresol, to afford a carboxylic ester, amide, acid, etc. having one more extended carbon atoms than the carboxylic acid chloride. There is no danger such as explosion or noxious gas accidents caused by diazomethane.
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