ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
NTosylaza[2.2]metacyclophane. - Preparation, Structure, helicity, Chiroptical Properties, and RacemizationSynthesis, structure, helicity, and chiroptical properties of the ten-membered helical N-tosylaza[2.2]metacyclophane 7a are described for the first time. 7a exist in a strained anti conformation, the inner (Hi-) protons of which absorb at high field (4.13, 4.34 ppm). The enantiomers of 7a were enriched by low-pressure chromatography on triacetylcellulose (TAC). Specific rotations, barrier of racemization, and circular dichrograms are discussed with respect to comparison compounds.
Notes:
Synthese, Röntgen-Kristallstrukturanalyse und Eigenschaften des zehngliedrigen N-Tosylaza[2.2]metacyclophans 7a werden erstmals beschrieben. 7a liegt in einer gespannten anti-Konformation vor, deren innere (Hi-)Protonen bei hohem Feld (4.13, 4.34 ppm) absorbieren. Die Enantiomere von 7a wurden an Triacetylcellulose (TAC) niederdruck-chromatographisch angereichert. Spezifische Drehungen, Racemisierungsbarriere und Circulardichroismus werden anhand von Vergleichsverbindungen erörtert.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19881210503
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