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1H and 13C NMR aromatic solvent-induced shifts of n-alkanes

✍ Scribed by Kunio Nikki

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
370 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^1^H and ^13^C NMR spectra of a series of n‐alkanes (C~5~‐C~32~) were measured in CCl~4~, CDCl~3~, C~6~D~6~, C~6~H~5~Cl and C~6~D~5~CD~3~ and the aromatic solvent‐induced shifts (ASIS) are discussed. The chemical shifts of the inner methylene protons show a steady downfield shift as the carbon number of the n‐alkane increases, while the shifts of the methyl protons are smaller than those of the inner methylene protons in aromatic solvents. The ASIS of the outer carbons are larger than those of the inner carbons up to the sixth carbon from the end. The ASIS of the sixth and further inner carbons of the short chains are larger than those of the long chains. These results suggest that n‐alkanes have a folded structure in aromatic solvents and that the degree of folding increases with increasing chain length.

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