作者fuccky (a piece in the sky)
看板NTUAC88
标题有机解答,一定要看喔
时间Mon Nov 27 18:02:35 2000
hello hello
助教叫我把大家问他的提的ans po 上来
ques:3.4.5圆环,的哪一个reaction rate 较快?
(就是环上有一个br or cl 的取代基),经过sn1 or sn2 reaction
ans: 5 > 4 > 3
reason: it's sn1. it must have a carbocation,and it's a planar
so for 3-carbons the strainenergy will be the largeest.
for sn2 rxn, the trigonal-bipyramid is also a planar at the middle
of the transition state .for the smae reason,the rate is 5>4>3
大家考试顺利,
加油加油
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