Digitale Medien
Springer
Chemistry of heterocyclic compounds
12 (1976), S. 1133-1136
ISSN:
1573-8353
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The1H and13C NMR spectra of 9-vinylcarbazole and its 3-chloro, 3,6-dichloro, and 3-nitro derivatives were recorded and studied. It is shown that electron-acceptor substituents reduce the shielding of the β-carbon atom and the trans proton of the vinyl group. A good linear correlation between the chemical shifts of these nuclei and the Hammettσ para − constants with theρ values (3.78 for13Cβ and 0.28 for1Htrans) is observed. It was established by comparison of the results with the1H and13C NMR spectral parameters for some of the vinyl compounds that the degree of conjugation of the p electrons of nitrogen with theπ electrons of the double bond in 9-vinylcarbazoles is lower than in simple vinyl and vinyl phenyl ethers and vinyl acetate.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00945599
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