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. 1971 May;68(5):1083–1088. doi: 10.1073/pnas.68.5.1083

Assignments in the Carbon-13 Nuclear Magnetic Resonance Spectra of Vitamin B12, Coenzyme B12, and Other Corrinoids: Application of Partially-Relaxed Fourier Transform Spectroscopy

David Doddrell 1, Adam Allerhand 1,*
PMCID: PMC389118  PMID: 5280523

Abstract

High-resolution Fourier transform NMR at 15.08 MHz was used to observe the proton-decoupled natural-abundance 13C spectra of aqueous solutions of cobinamide dicyanide (0.067 M), cyanocobalamin (0.024 M), dicyanocobalamin (0.14 M), and coenzyme B12 (0.038 M). Assignments were made with the aid of chemical shift comparisons, off-resonance single-frequency proton decoupling, partially-relaxed Fourier transform spectra, and splittings arising from 13C-31P coupling.

As expected, the 13C spectra of the coronoids were appreciably more informative than the corresponding proton spectra. Nearly all the lines in the 13C spectra of the corrinoids were well-resolved single-carbon resonances, in spite of the structural complexity.

Partially relaxed 13C Fourier transform NMR spectra, which yield spin-lattice relaxation times of each resolved resonance, were found to be a very useful addition to the arsenal of NMR techniques.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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