- 作者: 甘炅鉉 ; 黃守齡 ; 何東英 等
- 作者服務機構: 台灣大學化學系
- 中文摘要: Proton and carbon-13 chemical shifts of para-substituted stilbenes have been measured./sup 1/H-/sup 1/H, /sup 1/H-/sup 13/C COSY spectra were obtained to analyze unambiguously the chemical shifts of protons and carbons. A long range coupling between 2-H and.alpha.-H was observed in a /sup 1/H-/sup 1/H COSY spectrum. The observed chemical shifts have been correlated with Hammett substituent parameters. Among ethenyl protons and carbons, all but the chemical shifts of .alpha.-H show good correlation with both dual substituent parameters and single substituent parameters. In addition to this finding, the excellent linear correlations of C-1, and 4'-H of 4-substituted trans-stilbenes are also reported. Besides the correlations of chemical shifts with Hammett parameters, a good correlation between the chemical shifts and the calculated charges of position C-4' are reported.
- 英文摘要: --
- 中文關鍵字: Substituent Effect; Proton; Carbon 13; 4-Substituted Trans-Stilbene; Chemical Shift; Nuclear Magnetic Resonance (Nmr); Stilbene
- 英文關鍵字: 取代效應;質子;碳13;化學位移;核磁共振;二苯乙烯