The Activation of Carbon−Chlorine Bonds in Per- and Polyfluoroalkyl Chlorides: DMSO-Induced Hydroperfluoroalkylation of Alkenes and Alkynes with Sodium Dithionite
作者:Zheng-Yu Long、Qing-Yun Chen
DOI:10.1021/jo9900937
日期:1999.6.1
omega-dichloroperfluoroalkanes, the similarly stepwise reactions with an alkene is not clean, both bis-adducts and the corresponding omega-hydrides, RCH(2)CH(2)(CF(2))(n)()H as byproducts are also formed. In the absence of alkenes or alkynes, per- and polyfluoroalkyl chlorides can be converted to their sulfinate salts and sulfonyl chlorides.
在DMSO中,全氟烷基氯,R(F)Cl与烯烃或炔烃的加成反应可以在75-(1.5)Na(2)S(2)O(4)和NaHCO(3)的存在下平稳进行80摄氏度,持续4-10小时,得到相应的加合物(RCH(2)CH(2)R(F)或RCH = CHR(F))。乙基氯氟-(1f),氯二氟-(1g)乙酸酯,甚至非氟化化合物,例如二氯乙基(1h),乙酸氯(1i)和氯仿(1j)也可以进行类似的反应。用> 3当量的烯烃和Na(2)处理ω-碘(或氯)全氟烷基氯化物[X(CF(2))(n)()Cl,n = 2、4,X = I或Cl] S(2)O(4)直接给出对称的双取代烷烃(RCH(2)CH(2))(2)(CF(2))(n)()。对称和非对称双取代的加合物RCH(2)CH(2)(CF(2))(n)()CH(2)CH(2)R' ω-碘全氟烷基氯也可以逐步得到,即通过单加合物RCH(2)CH(2)(CF(2))(n)