By direct cyanidation, the reaction of p-toluic acid with urea would convert the carboxyl group to cyano group to give p - tolunitrile.是什么意思_By direct cyanidation, the reaction of p-toluic acid with urea would convert the carboxyl group to cyano group to give p - tolunitrile.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句