ct74ls160

wherein l1, l2, l3, l4, and r* are as defined above.

(15分)(1)1:4(或4:1)(1分)(2)co>ca>ba(1分)f>s>as>fe

电离能 电负性 电负性 元素性质与电负性的关系(1)as原子的价电子排布

2-(aryl-sulfonyl)oxetanes as designer 3-dimensional fragments