## Abstract The preparation of substituted phenyl‐azo‐azulenes is described. The absorption spectra and the basicity of these compounds have been recorded.
Elektronenstruktur und physikalisch-chemische Eigenschaften von Azo-Verbindungen. Teil XII: Protonierung des m-Dimethylaminophenyl-azo-azulens
✍ Scribed by F. Gerson
- Publisher
- John Wiley and Sons
- Year
- 1963
- Tongue
- German
- Weight
- 721 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The absorption spectra of m‐dimethylaminophenyl‐azo‐azulene in weakly acid solutions have been recorded and the possible structures of its first conjugate acid discussed. In contrast to its p‐isomer, the compound is protonated mostly on the amino nitrogen, although a measurable amount of the azonium cation is also present. Chemical shifts of the amino methyl protons have been used to demonstrate the difference in protonation of the p‐ and m‐isomers. The proton resonance results are in qualitative agreement with the conclusions drawn from the absorption spectra in the visible region.
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