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Halochrome Molekeln. 7. Mitteilung. Synthese und acidobasisches Verhalten substituierter Heteroarenochinazoline
Author(s) -
Gunzenhauser Sigmund,
Balli Heinz
Publication year - 1988
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19880710105
Subject(s) - chemistry , protonation , fragmentation (computing) , mass spectrum , molecule , spectral line , medicinal chemistry , nmr spectra database , ring (chemistry) , stereochemistry , mass spectrometry , organic chemistry , ion , chromatography , physics , astronomy , computer science , operating system
Halochromic Molecules. Synthesis and Acidobasic Properties of Substituted Heteroarenoquinazolines We have synthetized a series of substituted heteroarenoquinazolines. The 90‐MHz FT 1 H‐NMR spectra of starting and final products supported the postulated structures. Fragmentation in the mass spectra also were consistant with the assumed structures. With acid, the compounds partly from ring‐opened, intensely coloured triphenylcarbenium salts of the Rhoduline‐R type (C. I. 42565). UV/VIS spectra of the salts are discussed on the basis of VEPPP‐CI 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.