aelectron-pair acceptor site电子对-接受体位置AcOH=acetic acid)乙酰基（如AcOH乙酸）Acacacetylacetonate乙酰丙酮酸酯Addnaddition加入AIBNa , q ' -azobisisobutyroniytilea,a '.偶氮双异丁腊Amamyl=pentyl戊基anhanhydrous无水的aqaqu