智者一席话,使人受益大.You could profit from listening to a wise man.蠢人饶舌, 智者思虑.A stupid fellow is talkative; a wise man is meditative.寂寞无扰于智者.A wise man is never less alone than when alone....
目的: 合成新的双-胡椒醛缩二胺类席夫碱化合物.Methods: Five Schiff bases were prepared from piperonal and diamines by condensation reaction.用胡椒醛为起始原料,经氯化 、 水解、缩合,制得血凝酸胺.After the process of chlorination, hydrolytic decomposition and condensat...