Assignment of the 1H n.m.r. spectrum of heptamethyl dicyanocobyrinate in chloroform solution by two-dimensional 13C/1H chemical shift correlation spectroscopy
- 31 December 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 10,p. 2267-2270
- https://doi.org/10.1039/p19840002267
Abstract
The1H n.m.r. chemical shifts of the vitamin B12 derivative heptamethyl dicyanocobyrinate (‘cobester’) in CDCl3 have been determined by two-dimensional 13C/1H chemical shift correlation spectroscopy at 75/300 MHz. For reasons of sensitivity a pulse scheme was employed which eliminates homonuclear spin-spin coupling in the F1 dimension between protons bonded to different carbon atoms. Large differences in 1H chemical shifts and changes of signal sequences are observed relative to Battersby's study of cobester solutions in C6D6.Keywords
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