Rearrangement of 2-iodo-3-perfluoroalkyl-1-propyl acetates to 1-iodo-3-perfluoroalkyl-2-propyl acetates
作者:M. Kotora、M. Hájek、J. Kvíčala、B. Ameduri、B. Boutevin
DOI:10.1016/s0022-1139(00)80559-x
日期:1993.10
2-Iodo-3-perfluoroalkylpropyl acetates, RFCH2CHICH2OAc (1) (RF = i-C3F7, C4F9, C6F13, C8F17), have been rearranged thermally to 1-iodo-3-perfluoroalkyl-2-propyl acetates, RFCH2CH(OAc)CH2I (2), in 89% yield over the temperature range 120–200 °C. The results indicate that the rearrangement is a reversible process which is shifted towards the formation of 2. The equilibrium regio isomer ratio (12 = 1:8)
乙酸2-碘-3-全氟烷基丙基酯R F CH 2 CHICH 2 OAc(1)(R F = iC 3 F 7,C 4 F 9,C 6 F 13,C 8 F 17)已热重排为1 -碘-3-全氟烷基-2-丙基乙酸酯,R F CH 2 CH(OAc)CH 2 I(2),在120–200°C的温度范围内,产率为89%。结果表明,重排是一个可逆的过程,向2的形成转移。。平衡区域异构体比率(12 = 1:8)与温度和R F取代基的性质无关。提出重排通过自由基机理进行,所述自由基机理包括在C 1 I键热断裂后乙酰氧基的1,2-迁移。