Visible Light-Mediated Atom Transfer Radical Addition via Oxidative and Reductive Quenching of Photocatalysts
作者:Carl-Johan Wallentin、John D. Nguyen、Peter Finkbeiner、Corey R. J. Stephenson
DOI:10.1021/ja300798k
日期:2012.5.30
visible light-mediated atom transfer radical addition (ATRA) of haloalkanes onto alkenes and alkynes using the reductive and oxidativequenching of [IrdF(CF(3))ppy}(2)(dtbbpy)]PF(6) and [Ru(bpy)(3)]Cl(2) is presented. Initial investigations indicated that the oxidativequenching of photocatalysts could effectively be utilized for ATRA, and since that report, the protocol has been expanded by broadening
Ruthenium(<scp>II</scp>)- and rhenium(<scp>III</scp>)-catalysed addition of tetrahalogenomethanes to alkenes and 1,ω-dienes. Stereoselective formation of cis-1,2-disubstituted cyclopentanes from 1,6-dienes
作者:Ronald Grigg、John Devlin、Ashok Ramasubbu、Ronald M. Scott、Paul Stevenson
DOI:10.1039/p19870001515
日期:——
Acetonitrile(trichloro)bis(triphenylphosphine)rhenium(III) is found to act as an initiator for the addition of carbon tetrachloride and bromotrichloromethane to terminal alkenes and dienes. Moderate to good yields of mono- and bis-adducts are obtained. 1,6-Dienes undergo a stereoselective addition-cyclization process with both the ReIII catalyst and with dichlorotris(triphenylphosphine)ruthenium (II) to give mixtures
Application of copper(I) halides to modifying reactivity of polyhalomethanes and arenesulfonyl chlorides in free-radical addition. “Cross-halogenation” reaction
作者:A. S. Dneprovskii、A. N. Kasatochkin、V. P. Boyarskii、A. A. Ermoshkin、A. A. Yakovlev
DOI:10.1134/s1070428006080033
日期:2006.8
In the free-radical addition of a number of organohalogen reagents to cyclic alkenes and dienes in the presence of copper(I) halides the composition of the reaction products is governed by the stage of a fast halogen transfer from the copper derivative to the alkyl radical. Under these conditions in contrast to the free-radical addition reactions initiated by UV light or peroxide initiators the intramolecular rearrangements are suppressed, the stereoselectivity of the reaction changes, and also some adducts contain halogen atoms different from those present in the organohalogen reagent employed.