<sup>1</sup>H,<sup>13</sup>C and<sup>19</sup>F NMR spectroscopy of polyfluorinated ureas. Correlations involving NMR chemical shifts and electronic substituent effects
作者:Antonio Abad、Consuelo Agulló、Ana C. Cuñat、Cristina Vilanova
DOI:10.1002/mrc.1560
日期:2005.5
prepared and characterized. Complete assignment of their 1H, 13C and 19F NMR data was undertaken and the correlation of the chemical shifts of the ureido protons with field‐inductive and mesomeric electronic substituent parameters was studied using the Swain–Lupton model. The best correlations were obtained when the study was limited to certain substitution patterns, e.g. non‐ortho, mono‐ortho‐ and
制备并表征了 17 种 N-(单、二、三、四和五氟苯基)-N'-(3-硝基苯基)脲。对它们的 1H、13C 和 19F NMR 数据进行了完整分配,并使用 Swain-Lupton 模型研究了脲基质子的化学位移与场感应和介孔电子取代基参数的相关性。当研究仅限于某些取代模式时,获得了最好的相关性,例如非邻位、单邻位和二邻位氟化脲,这揭示了苯环上邻位氟化程度可能引起的构象变化。此外,氟原子的化学位移与整个氟化脲组的 ipso 碳原子之间存在极好的线性互相关。版权所有 © 2005 John Wiley & Sons, Ltd.