Turkish Journal
of
Chemistry
chem@tubitak.gov.tr
Turkish Journal of Chemistry
Bromination of 2,3-dihydrobenzobarrelene and synthesis of its mono- and dibromide derivatives: unexpected Wagner-Meerwein rearrangement on silica gelAtatürk University, Faculty of Science, Department of Chemistry,
25240 Erzurum-TURKEY
e-mails: mesengul@atauni.edu.tr, adastan@atauni.edu.tr
Abstract: The bromination reaction of dihydrobenzobarrelene under different conditions was studied. The bromination reaction of dihydrobenzobarrelene with molecular bromine gave only a Wagner-Meerwein rearrangement product by aryl and alkyl migration. Its high-temperature bromination reaction resulted in the formation of normal addition products besides rearrangement products. The bromination reaction of the alkene with 1,2- dibromotetrachloroethane (DBTCE) gave a non-rearrangement product as the sole product. The synthesis and bromination reaction of 2-bromodihydrobenzobarrelene was also studied. An unexpected Wagner-Meerwein rearrangement was observed on silica gel during the column chromatography of isomeric tribromides. Herein, we report the results of the synthesis, and the X-ray crystal structures and the possible mechanism of processes are discussed.
Key Words: Bromination, benzobarrelene, Wagner-Meerwein rearrangement
Turk. J. Chem., 35, (2011), 587-598.
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Other articles published in the same issue: Turk. J. Chem.,vol.35,iss.4.