Radical addition reactions of fluorinated species Part 6. Regioselectivity of the addition of nucleophilic radicals to halogenopropenes and evidence for a steric effect of the chlorine substituent
作者:Oldřich Paleta、Vladimír Církva、Zuzana Budková、Stanislav Böhm
DOI:10.1016/s0022-1139(97)00083-3
日期:1997.12
regioselectivity of addition to 3-chloro-1,1,2,3,3-pentafluoropropene (1), 1,3-dichloro-1,2,3,3-tetrafluoropropene (2), 1,1,3-trichloro2,3,3-trifluoropropene (3) and 1,3-dichloro-2,3,3-trifluoropropene (4). The regioselectivity was strongly dependent on the number of chlorine atoms at the terminal position and on the character of the additive, Thus the two chlorine atoms in 3 completely reversed the regioselectivity
衍生自链烷醇和环状醚的亲核基团(氧杂环戊烷,1,3-二氧戊环,2,2-二甲基-1,3-二氧戊环)用于测试添加到3-氯-1,1,2,3的区域选择性, 3-五氟丙烯(1),1,3-二氯-1,2,3,3-四氟丙烯(2),1,1,3-三氯2,3,3-三氟丙烯(3)和1,3-二氯-2 ,3,3-三氟丙烯(4)。区域选择性强烈依赖于氯原子的数目在终端位置和添加剂的性质,因此,在两个氯原子3完全逆转区域选择性的抗Kharasch模式。随着烯烃中末端氯原子数目的增加,相对反应速率显着降低。1–3。在烯丙基氯原子1似乎模拟较长全氟烷基链。将实验结果与使用PM3和从头算(3–12G和6–311 + G **)方法计算的前沿轨道形状和电子密度进行了比较。报道了加合物向甲基丙烯酸氯氟烷基酯和氟化戊烷1,2-二醇的转化。