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- W2171203390 abstract "13C chemical shifts of C═N, C═O and C═S carbons of 3,4-disubstituted-1,2,4-oxadiazole-5-ones(thiones) and 3,4-disubstituted-1,2,4-thiadiazole-5-ones have been determined in CDCl3 solution. Exceptionally good Hammett correlations of 13C NMR chemical shifts of these carbons with σ were obtained. The negative ρ values observed (inverse substituent effects) indicate π-polarization of the C═N, C═O and C═S bonds. As expected, the long distance C═O and C═S 13C chemical shifts were found less susceptible to substituent-induced electronic changes." @default.
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- W2171203390 date "2004-07-01" @default.
- W2171203390 modified "2023-10-01" @default.
- W2171203390 title "<sup>13</sup>C NMR STUDY OF SUBSTITUENT EFFECTS IN 1,2,4-OXADIAZOLE AND 1,2,4-THIADIAZOLE DERIVATIVES" @default.
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- W2171203390 doi "https://doi.org/10.1080/10426500490463646" @default.
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