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Halochrome Molekeln. 6. Mitteilung. Spektrophotometrische Untersuchungen zum acidobasischen Verhalten substituierter 6,6-Diphenyl-6H-chromeno[4,3-b]indolizine und ihrer Aza-analogen

✍ Scribed by Sigmund Gunzenhauser; Heinz Balli

Publisher: John Wiley and Sons
Year: 1985
Tongue: German
Weight: 377 KB
Volume: 68
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19850680108

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✦ Synopsis

Halochromic Molecules. Spectrophotometric Investigation of the Acidobasic Behaviour of Substituted 6,6‐Diphenyl‐6__H__‐chromeno[4, 3‐b]indolizines and their Aza‐analogues

Substituted 6,6‐diphenyl‐6__H__‐chromeno[4,3‐b]indolizines form ring‐opened, intensely coloured (diphenyl)‐indolizinylcarbenium salts with acid. UV/VIS spectra of the coloured salts are discussed on the basis of VEPPPCI calculations. The ϵ~pH~* curves in buffered MeOH/H~2~O solutions and the p__K__* values are determined. The title compounds undergo very complex protonation equilibria.

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Halochrome Molekeln. 5. Mitteilung. Synthese substituierter 6H-Chromeno[4,3-b]indolizine und ihrer Aza-analogen

✍ Sigmund Gunzenhauser; Heinz Balli 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 German ⚖ 451 KB

**Halochromic Molecules. Synthesis of Substituted 6__H__‐Chromeno[4,3‐__b__]indolizines and their Aza‐analogues** We have synthesized a series of substituted chromeno[4,3‐__b__]indolizines and their respective aza‐analogues. Dyes generated from them contain the electrondonating 2‐(2‐hydroxy‐5‐methy