1H and13C NMR study of substituent effects in 2- and 3-substituted diphenyl sulphides and sulphones and 4-substituted 2′,6′-dimethyldiphenyl sulphides
作者:Subbu Perumal、Ramasubbu Chandrasekaran、Veerappan Vijayabaskar、David A. Wilson
DOI:10.1002/mrc.1260331004
日期:1995.10
The proton and carbon NMR spectra of nine 2‐substituted diphenyl sulphides (S‐2‐X), seven 3‐substituted diphenyl sulphides (S‐3‐X), nine 2‐substituted diphenyl sulphones (SO2‐2‐X), nine 3‐substituted diphenyl sulphones (SO2‐3‐X) and nine 4‐substituted‐2′,6′‐dimethyldiphenyl sulphides (Me2‐S‐4‐X) were obtained. Correlations of the 1H and 13C chemical shifts were made with benzene substituent‐induced
九个 2-取代二苯硫醚 (S-2-X)、七个 3-取代二苯硫醚 (S-3-X)、九个 2-取代二苯砜 (SO2-2-X)、九个获得了 3-取代的二苯砜 (SO2-3-X) 和 9 个 4-取代的-2',6'-二甲基二苯硫醚 (Me2-S-4-X)。将 1H 和 13C 化学位移与苯取代基诱导的化学位移(林奇图)、哈米特和双取代基参数相关联,并将结果与 4-取代二苯硫醚 (S-4-X) 和砜的结果进行比较(SO2-4-X)。主要结论如下:(i) 取代的二苯硫醚中取代基效应的传递以 S-4-X ≈︁ S-2-X > Me2-S-4-X > S-3-X 的顺序降低; (ii) 感应效应比共振效应传递到 3-取代二苯硫醚中的未取代环的程度更大,而在其他取代二苯硫醚中观察到相反的趋势;(iii) 在 2-甲氧基-、2-氯-、2-溴-和 2-硝基二苯基硫化物中,取代基尺寸的增加导致 H-6 的高场