Approximate rate constants for intermolecular additions of alkyl radicals to phenylsulfonyl oxime ethers
作者:Sunggak Kim、Ill Young Lee
DOI:10.1016/s0040-4039(98)00035-5
日期:1998.3
Approximate rateconstants for intermolecular additions of alkylradicals to phenylsulfonyl oxime ethers (2a and 2b) have been determined to be ka=9.6×105 M−1s−1 at 25 °C for 2a and ka=7.3×104 M−1s−1 at 60 °C for 2b, indicating that the additions are fast and highly efficient processes. The kinetic data have been confirmed by two competition experiments.
已确定在25°C下2a和k a = 7.3×10 4的分子间烷基向苯磺酰基肟醚(2a和2b)分子间加成的近似速率常数为k a = 9.6×10 5 M -1 s -1。M -1 s -1在60°C下持续2b,表明添加是快速且高效的过程。动力学数据已通过两次竞争实验得到证实。
Tin-Free Radical Acylation Reactions with Methanesulfonyl Oxime Ether
decomposition of the methanesulfonyl radical into the methyl radical and the subsequent transfer of an iodine atom or phenyl telluride group was used to develop a tin-freeradical acylation reaction (see scheme; V-40=1,1'-azobis(cyclohexane-1-carbonitrile). The key was finding reactionconditionsunder which the I or PhTe transfer is faster than the direct addition of the alkyl radical to the methanesulfonyl oxime