三个系列的新的1-甲基-2-取代的5-吡咯基羰基氟化氮氧化物,分别为3(R f = C 2 F 5),4(R f = n -C 3 F 7)和5(R f = n -C 7 F 15),是由11种1-甲基-2-取代的吡咯5-甲醛(6)与H提取剂[R f N(O •)的H提取/自旋捕获反应生成的R f ] 1和自旋俘获剂REPR对f NO 2进行了研究。它们的N值与极性和自旋离域取代基常数的相关性分析表明,N值主要受2-取代基的极性作用的影响,但自旋离域作用也存在。
ESR studies of ω-hydroperfluoroalkyl 1-methyl-2-substituted-pyrrolyl-5-carbonyl nitroxides and dual-parameter correlation analysis of their hyperfine splitting constants
1-methyl-2-substituted-pyrrolyl-5-carbonyl nitroxides, i.e., 5 and 6 generated in the H-abstraction/spin trapping reaction of twelve 1-methyl-2-substituted-pyrrolyl-5-carbaldehydes 1 with the H-abstracting agent RfN(O⋅)Rf (2) and the spin-trapping agent RfNO (4), were studied by ESR. Correlation analysis of the aN values of 5 and 6 with polar and spin-delocalization substituentconstants shows that aN values are mainly
两个系列的ω-氢全氟烷基1-甲基-2-取代的吡咯基-5-羰基氮氧化物,即5和6,它们在十二个1-甲基-2-取代的吡咯基-5- 5的H吸收/自旋捕获反应中产生通过ESR研究了具有H吸收剂R f N(O⋅)R f(2)和自旋捕集剂R f NO(4)的甲醛1。所述的相关性分析一个Ñ的值5和6与极性和旋离域取代基常数表明,一个Ñ 值主要受极性效应的影响,但自旋离域效应也存在。