REGIOSELECTIVITY OF RADICAL ATTACKS ON SUBSTITUTED OLEFINS - APPLICATION OF THE SCD MODEL

被引:96
作者
SHAIK, SS [1 ]
CANADELL, E [1 ]
机构
[1] UNIV PARIS 11,CHIM THEOR LAB,F-91405 ORSAY,FRANCE
关键词
D O I
10.1021/ja00160a023
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The SCD model is used to derive regiochemical trends in radical addition to olefins. Regiochemistry is discussed by appeal to two fundamental properties of the radical and the olefin. The first factor is the relative spin density in the 3ππ* state of the olefin. Thus, radical attack is directed toward the olefinic carbon which possesses the highest spin density. The second factor is the relative bond strengths of the radical to the olefinic carbons. This factor directs the regiochemistry toward the olefinic terminus which forms the strongest bond with the radical. When the two effects join up, regioselectivity will be large, e.g., for CH2=CHX (X = NR2, CR, Cl, CN, Ph). When the two effects oppose one another, regioselectivity will be smaller, and regioselectivity crossovers are expected, e.g., for CF2=CHF. The “normal” regiochemistry is shown to coincide with the spin density rule which makes identical predictions to the HOMO rule. © 1990, American Chemical Society. All rights reserved.
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页码:1446 / 1452
页数:7
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