Determination of aromaticity indices of thiophene and furan by nuclear magnetic resonance spectroscopic analysis of their phenyl esters
作者:Chang Kiu Lee、Ji Sook Yu、Hye-Jin Lee
DOI:10.1002/jhet.5570390615
日期:2002.11
series of m- and p-substituted phenyl benzoates, 2-thienoates, and 2-furoates were prepared and their 1H and 13C nmr spectroscopic characteristics were examined. In general, good correlations were observed between the chemical shift values of protons and carbons of the acyl aromatic rings and the Hammett σ. Plots of the chemical shift values of the carbonyl carbons of the benzoates against those of
一系列的米-和p取代的苯基苯甲酸酯,2- thienoates和2-糠酸盐,制备和它们的1个H和13进行了检查C NMR光谱特征。通常,在酰基芳环的质子和碳的化学位移值与哈米特σ之间观察到良好的相关性。苯甲酸酯的羰基碳的化学位移值与2-硫代酸酯和2-糠酸酯的化学位移图具有极好的相关性,在二甲基亚砜-d 6和0.90和0.90中斜率值分别为0.85和0.75。氯仿中d分别为0.78 。该值可以被认为是一组芳香性指数。