## Abstract The potential of ^13^C NMR techniques for studies of nicotine metabolism has been investigated by acquisition and assignment of ^13^C NMR spectra of nicotine, its metabolites and some related compounds. It is shown that Cβ2β² of nicotine would be the best site for ^13^C labelling when us
Carbon-13 nuclear magnetic resonance spectra of some 12-keto steroids and related compounds
β Scribed by M. Biesemans; G. van De Woude
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Weight
- 514 KB
- Volume
- 92
- Category
- Article
- ISSN
- 0037-9646
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REFERENCE DATA causes the electron density to be comparatively lower at C-3 and C-5 than at C-2 and C-4, so that the former signals resonate at lower fields. Distinction between the signals of the C-2/C-4 and C-3/C-5 pairs was achieved by comparing the C-H coupling patterns of 5 and 1. Compounds 1,
## Abstract Fourier transform carbonβ13 nuclear magnetic resonance spectra have been obtained and interpreted for some 2βsubstituted tetrahydropyrans. The effects of the substituents on Ξ±, Ξ², Ξ³ and Ξ΄βcarbon atoms are discussed. Using suitable reference compounds the Ξ³βparameter can be used for quan
## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of veratridine and cevadine.
## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of the alkamines veracevine, germine and zygacine derived from steroidal alkaloids of the ceveratrum class. Assignment of signals was aided by analysis of the partially relaxed spectrum of cervagenine 9,12