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Conformational analysis of benzoannulated nine-membered rings. Part 4—7,8-dihydro-6H-dibenzo[f,h][1,5]dioxonin and its derivatives

✍ Scribed by Barbara Rys; Helmut Duddeck

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
281 KB
Volume
33
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Temperature‐dependent ^1^H and ^13^C NMR spectra of the title compounds are presented. The coalescence effects in the spectra are discussed and assigned to the racemization of the C~2~ symmetry conformation of the nine‐membered ring. The barrier of this process is ca. 64 kJ mol^−1^. A spirocyclohexane derivative revealed a second conformational process namely inversion of the six‐membered ring.

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