Synthetic and mechanistic aspects of the reactions between bromodifluoromethyltriphenylphosphonium bromide and dibromofluoromethyltriphenylphosphonium bromide and trialkylphosphites
作者:Richard M. Flynn、Donald J. Burton、Denise M. Wiemers
DOI:10.1016/j.jfluchem.2008.04.003
日期:2008.7
exchange process involves the formation of difluorocarbene via dissociation of the intermediate difluoromethylene ylide, capture of the difluorocarbene by the trialkylphosphite to give [(RO)3P+CF2−], which captures bromine followed by dealkylation to the product, bromodifluoromethylphosphonate. The equilibria involved in the multi-step mechanism are all shifted to the phosphonate product by the final dealkylation
Synthetic and mechanistic aspects of halo-F-methylphosphonates
作者:Richard M. Flynn、Donald J. Burton
DOI:10.1016/j.jfluchem.2011.05.034
日期:2011.10
The synthesis of a variety of new halo-F-methylphosphonates has been achieved by a Michaelis–Arbuzov type reaction between a halo-F-methane and a trialkyl phosphite. This synthesis has proved to be of wide scope and utility for the high yield preparation of a number of heretofore unknown compounds. The 1H, 19F, 13C and 31P NMR spectroscopic properties are reported in detail. The mechanism for the formation
Hydrophosphonodifluoromethylation of Alkenes via Thiyl-Radical/Photoredox Catalysis
作者:Wenhao Huang、Jingzhi Chen、Daocheng Hong、Wenxin Chen、Xu Cheng、Yuxi Tian、Guigen Li
DOI:10.1021/acs.joc.7b02354
日期:2018.1.19
Visible-light-induced catalytic hydrophosphonodifluoromethylation of mono- and disubstituted alkenes using bromodifluoromethanephosphonate with a Hantzsch ester as the terminal reductant is reported. The combination of thiyl-radical catalysis with photoredoxcatalysis is important for achieving good chemoselectivity and high yields.