Studies on fluoroalkylation and fluoroalkoxylation. Part 10. Electron-transfer induced reactions of perfluoroalkyl iodides and the dialkyl malonate anion and β-fragmentation of the halotetrafluoroethyl radical
作者:Qing-Yun Chen、Zai-Ming Qiu
DOI:10.1016/s0022-1139(00)81433-5
日期:1986.4
malonic ester anion () in DMF to give (), 1-hydroperfluoroalkane () and dimer of the anion (). The reaction is accelerated by UV irradiation and partly suppressed by p-DNB. Diallyl ether (DAE) can trap the radical intermediates to afford five-membered ring products. Interestingly, in the case of ( X = Cl, I ) the same reaction mainly yielded tetrafluoroethylene and instead of and . The radical intermediate
氟代烷基碘化物XCF 2 CF 2 I(X = F,全氟烷基)()与DMF中的丙二酸酯阴离子()容易反应,得到(),1-氢全氟烷烃()和阴离子的二聚体()。该反应通过紫外线辐照而加速,部分被p-DNB抑制。二烯丙基醚(DAE)可以捕获自由基中间体,从而提供五元环产物。有趣的是,在(X = Cl,I)的情况下,相同的反应主要生成四氟乙烯,而不是和。自由基中间体XCF 2 CF · 2(X = Cl)也可以被DAE捕获,生成四氢呋喃衍生物。所有这些结果都可以根据S RN 1机制进行合理化。