Degenerative xanthate transfer to olefins under visible-light photocatalysis
作者:Atsushi Kaga、Xiangyang Wu、Joel Yi Jie Lim、Hirohito Hayashi、Yunpeng Lu、Edwin K L Yeow、Shunsuke Chiba
DOI:10.3762/bjoc.14.283
日期:——
The degenerative transfer of xanthates to olefins is enabled by the iridium-based photocatalyst [IrdF(CF3)ppy}2(dtbbpy)](PF6) under blue LED light irradiation. Detailed mechanistic investigations through kinetics and photophysical studies revealed that the process operates under a radical chain mechanism, which is initiated through triplet-sensitization of xanthates by the long-lived triplet state
Visible light/Ir(III) photocatalytic initiation of xanthate-based radical-chain reactions: Xanthate group transfer and oxidative addition to aromatic systems
作者:Pedro López-Mendoza、John E. Díaz、Alix E. Loaiza、Luis D. Miranda
DOI:10.1016/j.tet.2018.04.079
日期:2018.9
The protocol can be used in classical xanthate-based inter- and intra-molecular group transfer reactions and oxidative radical addition to several heteroaromatic systems. The process does not require high temperature and reactions are cleaner compared with the traditional peroxide initiation. In the oxidative addition to aromatic systems, the oxidation process is part of the catalytic cycle and does