Treatment of α-(trifluoromethyl)styrenes with arylboronic esters and MeMgCl in the presence of a rhodium(I) catalyst affords gem-difluoroalkenes. The reaction proceeds through the addition of arylrhodium(I) species across the electron-deficient carbon–carbon double bond and the subsequent β-fluoride elimination.
α-(三
氟甲基)
苯乙烯与芳基
硼酸酯和
氯化亚甲基
镁在
铑(I)催化剂的存在下反应,生成gem-二
氟烯烃。该反应通过芳基
铑(I)物种加成到电子缺乏的碳-碳双键上,随后发生β-
氟离去反应。