## Abstract The present paper shows that it is possible to elucidate the tautomerism in the case of hydroxyacyl‐cyclopeptides (open forms‐cyclols‐large rings) with the aid of absorption measurements in the far ultra‐violet spectral range.
Über die UV.-Absorption acylierter Amide und Harnstoffe. 1. Mitteilung über chemische Struktur und UV.-Spektroskopie. 1. Mitteilung über Struktur und Reaktivität heterocyclischer Verbindungen
✍ Scribed by H. G. Leemann; K. Stich; J. Gmünder; A. Lindenmann
- Publisher
- John Wiley and Sons
- Year
- 1963
- Tongue
- German
- Weight
- 175 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Using ultra‐violet absorption spectroscopy below 210 mμ it becomes possible to characterize amide chromophores. The present short communication shows that open chain amides and ureas absorb at shorter wave‐lengths than the corresponding cyclic representatives, and that UV. absorption measurements also yield an indication of the degree of acylation in the amide function.
📜 SIMILAR VOLUMES
## Abstract By means of spectrophotometric measurements the order of reaction in the aminolysis of «active esters» has been determined. In order to compare the reaction velocities of various «active esters», test conditions have been chosen so that «pseudo‐first order» reactions occur; this allows
**Ring Closure in Quinonylmethane Dyes On the Reactivity of the Cyciohexyl Moiety in 2‐Chloro‐3‐[(1‐cyclohexyl‐6‐fluoro‐3‐methyl‐1__H__‐quinoxalin‐2‐ylidene)niethyl]‐1,4‐naphthoquinonc** The reactive title compound (**1a**, **X** = **F**, **R**^1^ = C^6^H^11^, **R**^2^=Cl) was obtained from the rea