Preparation method of 4-(aminomethyl)benzene-1-sulfonic acid_Kain Industrial Additive

background and overview[1] 4-(aminomethyl)benzene-1-sulfonic acid can be used as a pharmaceutical synthesis intermediate. preparation[1-2] 4-(aminomethyl)benzene-1-sulfonic acid is prepared as follows: method 1: add 10ml benzylamine dropwise to 30ml 20% fuming h2so4 at 0°c with stirring. the mixture was warmed to room temperature and stirred for 30 minutes, then to 80°c for 1 hour. after cooling…