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Substituent effects in aromatic proton nmr spectra. II.: The effect of substituent diamagnetic anisotropy.

✍ Scribed by Yujiro Nomura; Yoshito Takeuchi

Publisher
Elsevier Science
Year
1968
Tongue
French
Weight
233 KB
Volume
9
Category
Article
ISSN
0040-4039

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✦ Synopsis

Becently mrrh attention has been paid to the bond or rubstituent diamagnetic anisotropy effect on proton nmr chemical shift(2). In estimating the long-ranBe diamagwtic anisotropy effect, McConnell88 equation( ), bani = CAx(1 -3cor20)3/ 3x3 , has frequently been used and scassttis a satisfactory agreement was reported between the predicted and observed shifts for aliphatic or alicyclic caapounds containing C-C(4,5),C=C(5), c%(6), GN(6) or C&alogen(4,7) bonds. An application of this equation to nmr spectra of halobensenes wss, however, rather unsuccessful

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