Reactions of gem-Difluorinated Phosphonium Salts Induced by Light

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• 作者：Liubov I. Panferova ; Artem V. Tsymbal ; Vitalij V. Levin ; Marina I. Struchkova ; Alexander D. Dilman
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：March 4, 2016
• 年：2016
• 卷：18
• 期：5
• 页码：996-999
• 全文大小：370K
• ISSN：1523-7052

文摘

gem-Difluorinated phosphonium salts, which are readily obtained from aldehydes and difluoromethylene phosphobetaine, can serve as a source of radicals under reductive conditions. An iridium complex or Hantzsch ester was used as a one-electron reducing agent when irradiated with visible light. The fluorinated radicals were trapped with various alkenes, leading to products either via a photoredox cycle (for the iridium catalyst) or via a hydrogen atom transfer (for the Hantzsch ester).