13C NMR chemical shift assignments have been made for a series of 1-substituted carbazoles, 8-substituted 1.2,3,4-tetrahydrocarbazoles, 1 -substituted benzo[a]carbazoles and 6-substituted dibenzo-[c,g]carbazoles. Single examples were examined of other classes of substituted carbazoles: 3-butylcarbaz
Additivity scheme for 13C NMR chemical shifts in triangulanes
β Scribed by Kirill A. Lukin; Sergei I. Kozhushkov; Nikolai S. Zefirov
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 236 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
The ^13^C NMR spectra of triangulanes, the unique class of hydrocarbons constructed from spiroannulated cyclopropanes, were analysed, and correlations were revealed between their structures and ^13^C chemical shifts. The procedure for the configurational assignment in triangulanes based on the ^13^C NMR spectral data is described.
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H and 13C NMR chemical shifts and the homo-and heteronuclear coupling constants of 14 nitroxanthones are presented. Specific nitro increments for xanthones depending on substituent position and on the respective ring carbon position and shift additivity rules were developed by means of multiple line
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## Abstract ^13^C NMR spectra of a large number of polyalkylated benzenes with branched and linear aliphatic chains have been studied. This resulted in the development of a general procedure that can be used for the calculation of the aromatic chemical shifts in any polyalkylated benzene.
The I3C NMR spectra of various 1aminopyrrole derivatives are reported and the chemical shift assignments are discussed. The NMR assignments were confirmed by MNDO calculations.