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Relationships between 1H, 13C and 17O NMR chemical shifts and H/D isotope effects on 13C and 17O nuclear shielding in intramolecular hydrogen-bonded systems

✍ Scribed by E. Liepiņš; M. V. Petrova; E. Gudriniece; J. Pauliņš; S. L. Kuznetsov

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
698 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

The intramolecular H-bond strength in cis-enolic forms of b-diketones was investigated. The correlations between the 'H hydroxyl proton shieldings and the chemical shifts of the "C and "0 nuclei involved in the chelate ring, and the H/D isotope shifts on the latter resonances, were determined. An increase in the hydrogen bond strength leads to increasing values of H/D isotopic shifts on the "0 resonances. The results obtained are compared with quantum chemical calculations and x-ray measurements. KEY WORDS 'H, 13C, "0 NMR chemical shifts H/D isotope effects Intramolecularly hydrogen-bonded systems

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