step alkylation with Rf8(CH2)3I is described. The fluorophilicity values of 1–6 were determined by GC and range from 0.79±0.07 (1) to 5.3±0.2 (3). Systematic ab initio calculations of proton affinities of model compounds (7a–j) using Hartree–Fock and density functional theory imply that the inserted trimethylene spacer unit efficiently reduces the electron-withdrawing effect of the perfluorinated segment
为
全氟辛基-丙基胺的制备(A方便和有效的方法[R F8(CH 2)3 ] ñ NH 3- Ñ(1 - 3),Ñ = 1,2,3; R F8(CH 2)3 NHMe (4); [R f8(CH 2)3 ] 2 NMe(5); R f8(CH 2)3 NMe 2(6); R f8 = F(CF 2)8)描述了通过与R f8(CH 2)3 I逐步烷基化的方法。的fluorophilicity值1 - 6通过GC测定以及从0.79±0.07(范围1)到5.3±0.2(3)。使用Hartree-Fock和密度泛函理论对模型化合物(7a – j)的质子亲和力进行系统的从头计算,表明所插入的三亚甲基间隔单元可有效降低
全氟链段的电子吸收效应。所有结构均通过多核一维和二维NMR实验验证,其中涉及同核()和杂核(,- ,– )基于GMQF
COPS和反向和/或检测到的GHSQC,GHMQC序列与宽带绝热解耦的相关性。