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Carbon-13 and related NMR chemical shifts in alkylammonium and alkylphosphonium salts

✍ Scribed by David J. Evans; G. Jeffery Leigh; Colin J. Macdonald

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 296 KB
Volume: 28
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260280810

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✦ Synopsis

Abstract

The ^13^C NMR chemical shifts of the α‐carbon atoms in cations [NR~4~]^+^, [NR~3~CH~2~Ph]^+^ and [PR~4~]^+^ [R = Me, Et, Pr^n^, Bu^n^ or Pe^n^ (n‐pentyl)] are found at anomalously high field in comparison with the corresponding shifts in RCl or RNH~2~. This is ascribed in part to the effect of the positive charge. The effect is detectable but less pronounced with β‐carbon atoms, but is not detectable in subsequent carbon atoms in longer alkyl chains.

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