The monoprotonated biguanides phenformin hydrochloride, buformin hydrochloride and metformin hydrochloride were investigated by 15 N NMR spectroscopy. The structure of all hydrochlorides is best described by a 1,3-diazabutadienic skeleton with three amino groups and its corresponding mesomeric forms
Investigation of the Tautomerism of 15N-Labeled Hydroporphyrins by Dynamic NMR Spectroscopy
β Scribed by Dipl.-Chem. Martin Schlabach; Dr. Helmut Rumpel; Prof. Dr. Hans-Heinrich Limbach
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 451 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0044-8249
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β¦ Synopsis
where R is the gas constant and F the Faraday constant. The origin of the factor of 114 is the equation (b),
π SIMILAR VOLUMES
The tautomerism and isomerism of triazoles make the structure analysis of such compounds a difficult problem, and in the case of several nitrotriazoles a detailed structure assignment had been lacking up to now. Supported by selected compounds, a deΓnite structure determination of ten nitrotriazoles
The oxidized forms of the redox proteins putidaredoxin and putidaredoxin-15N were prepared by insertion of suitable plasmids into E. coli and the structures of the proteins were studied by homo-and heteronuclear 1H and 15N NMR methods, including identiΓcation of 15N resonance types by one-and two-di