The protonation of acetone in water for a wide range of compositions of the binary mixture was studied by multinuclear NMR spectroscopy. Formation constants (Ill and K2) and 13C, "0 and 'H chemical shifts of the 1: 1 and 1:2 complexes were evaluated. The correlation of the 'H chemical shift of uncom
A 17O NMR study of the protonation of urea
β Scribed by B. Valentine; T. E. St. Amour; D. Fiat
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 357 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0749-1581
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## Acknowledgements The author thanks UMYMFOR (CONICET-FCEyN-UBA) and lic. Dario Doller for generous technical support, and the Universidad de Buenos Aires for financial support. l-Ethyl-9-(l'-ethyl-9'H-py~idof3,4-b]indol-3'-yl)pyrido(3,4-b)indole (22). Colourless plates from benzene-EtOH, m.p.
Natural abundance "0 NMR spectra for 42 aliphatic and 13 cyclic enaminones with tertiary amino groups are reported. The "0 NMR chemical shifts of enaminones depend upon the type, number and position of the substituents. Substituents at C-1 cause shielding, and those at C-2 or C-3 cause deshielding.
Multiple-quantum magic-angle spinning and double-rotation NMR techniques were applied in the high field of 17.6 T to the study of oxygen-17-enriched zeolites A and LSX with the ratio Si/Al = 1. A monotonic correlation between the isotropic value of the chemical shift and the Si-O-Al bond angle Ξ± (ta
The '"0 NMR chemical shift data for 23 9-fluorenones in acetonitrile at 75OC are reported. '"0 NMR data for the kubstituted 9-fluorenones are correlated with '"0 NMR data for 4-substituted acetophenones. Chemical shift data for 1-halogen\*9-fluorenones are deshielded relative to the fisomers, sugges
Natural abundance 17O NMR spectra of 41 2,2-diacylenamines (enamino diketones and enamino diesters), recorded in acetonitrile solution, are reported. Tertiary enamino diketones show only one 17O signal ; primary and secondary derivatives show two 17O signals. The shift di β erence between the two car