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An analysis of 13C nuclear magnetic resonance substituent chemical shifts in 4- and 5-substituted thiophene-2-carboxylic acids by linear free energy relationships
作者:Renato Noto、Liliana Lamartina、Caterina Arnone、Domenico Spinelli
DOI:10.1039/p29870000689
日期:——
The 13C n.m.r. chemical shifts of some 4- and 5-substituted thiophene-2-carboxylic acids and of the corresponding anions have been measured in methanol. The observed substituent chemical shifts have been compared with the calculated values and then analysed according to single and dual substituent parameter linear free energy relationships. The results have been rationalized in terms of separate resonance
已经在甲醇中测量了一些4-和5-取代的噻吩-2-羧酸以及相应的阴离子的13 C nmr化学位移。已将观察到的取代基化学位移与计算值进行比较,然后根据单和双取代基参数线性自由能关系进行分析。就取代基效应的独立共振和感应贡献而言,结果已得到合理化。共振项表明在环与羧基之间不发生共轭。
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Huddleston, Patrick R.; Barker, John M.; Stickland, Barbara, Journal of Chemical Research, Miniprint, 1988, # 8, p. 1871 - 1890
作者:Huddleston, Patrick R.、Barker, John M.、Stickland, Barbara、Wood, Michael L.、Guindi, Laila H. M.
DOI:——
日期:——
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Gronowitz, Arkiv foer Kemi, 1958, vol. 12, p. 239,243
作者:Gronowitz
DOI:——
日期:——
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Banks, Malcolm R.; Barker, John M.; Huddleston, Patrick R., Journal of Chemical Research, Miniprint, 1984, # 2, p. 369 - 389
作者:Banks, Malcolm R.、Barker, John M.、Huddleston, Patrick R.
DOI:——
日期:——
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HALLBERG A.; GRONOWITZ S., CHEM. SCR. 1980, 16, NO 1-2, 38-41
作者:HALLBERG A.、 GRONOWITZ S.
DOI:——
日期:——