Carbon-13 nuclear magnetic resonance spectroscopy as a method to determine relative acidity of boron Lewis acids in pyridine complexes
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 6,p. 771-773
- https://doi.org/10.1039/p29870000771
Abstract
Complexes of pyridine and 2-ethylpyridine with a series of boron Lewis acids have been studied using 1H, 11B, and 13C n.m.r. The difference in chemical shifts (Δδc – 4) between the boron complex and the free pyridine were correlated with calorimetric data. The 13C data show that Δδc – 4 of pyridines provides a measure of the strength of the N → B bond, thus allowing a scale of acidity for boron compounds to be derived.Keywords
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