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- W1981356923 abstract "Analysis of 13 C nuclear magnetic resonance spectra of six 4-F-methyl coumarins are reported. This 4-F-alkyl substituent has a very slight effect on the chemical shifts of different carbon atoms. Only the C-10, C-4, and C-5 atoms are really affected and are shifted towards higher fields. The size of these effects was evaluated and compared with the corresponding effects of a 4-methyl substituent. The most important fact is the appearance of a 4 J CF (and 5 J CF for 6) coupling constant. We have shown that this effect is a through-space coupling." @default.
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- W1981356923 date "1987-06-01" @default.
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- W1981356923 title "Étude en résonance magnétique nucléaire du <sup>13</sup>C des F-méthyl-4 coumarines" @default.
- W1981356923 doi "https://doi.org/10.1139/v87-228" @default.
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