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Konfigurationen und Konformationen von zwei 2,4,6,8‐Tetrabrom‐cyclooctan‐1, 5‐dionen
Author(s) -
Heller Jürg E.,
Dreiding André S.
Publication year - 1973
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.19730560217
Subject(s) - cyclooctane , chemistry , conformational isomerism , stereochemistry , crystallography , molecule , cyclohexane , organic chemistry
The two isomeric tetrabromides, α‐isomer mp. 198° and β‐isomer mp. 226° described in [1], are identified as cis, cis, trans ‐2, 4, 6, 8‐tetrabromo‐cyclooctane‐1, 5‐dione ( 2 ) and cis, trans, cis ‐2, 4, 6, 8‐tetrabromo‐cyclooctane‐1, 5‐dione ( 3 ) by an analysis of their NMR.‐spectra which also allows a derivation of their preferred conformations. Both exist in solution as boat‐chair conformers, the geometries of which correlate well with the IR.‐ and UV.‐spectra.