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Penta‐und Hexabrombullvalene
Author(s) -
Rebsamen Karl,
Schröder Gerhard
Publication year - 1993
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19931260623
Subject(s) - chemistry , cis–trans isomerism , column chromatography , structural isomer , stereochemistry , chromatography
Penta‐and Hexabromobullvalenes The Pentabromobullvalenes 2a–d and the hexabromobullvalenes 3a/b are synthesized and the corresponding isomers are identified. 2 constitutes an equilibrium of four isomers. The isomer 2a is separated from the mixture by column chromatography. For the kinetically most stable isomer 2a the half‐life time for equilibration at 55°C amounts to ca. 30 h. Two non‐equilibrating isomers 3a and 3b are isolated, however, in the case of hexabromobullvalene 3 . The bullvalene‐typical property of a fluxional structure is now practically no longer existent.