Magnitudes of 18O isotope shifts in 13C nuclear magnetic resonance spectra of ketones and alcohols
- 1 July 1980
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 58 (13) , 1311-1315
- https://doi.org/10.1139/v80-204
Abstract
The magnitudes of 18O-induced isotope shifts in 13C nmr spectra of ketones and aldehydes are dependent on structure and range from about 0.05 ppm to 0.03 ppm for the carbon attached to 18O. An increase in negative charge density on the carbonyl oxygen or conjugation to an aromatic ring reduces the size of the upfield shift. The shifts in [18O]alcohols are solvent-dependent, range from 0.03 ppm to 0.01 ppm, and tend to decrease in the order tertiary ≥ secondary ≥ primary ≥ phenols.Keywords
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