1-Bromocyclohexa-1,4-diene (3) was prepared from trans-4,5-dibromocyclohexene by elimination of hydrogen bromide. Treatment of a solution of 3 in furan or 2,5-dimethylfuran with KOtBu afforded the tetrahydroepoxynaphthalenes 4 and 5, respectively. The structure of these products is evidence for the title cycloallene (isobenzene 1) being the reactive intermediate. The compounds 4 and 5 were dehydrogenated
Electrochemical bromofunctionalization of alkenes in a flow reactor
作者:Jakob Seitz、Thomas Wirth
DOI:10.1039/d1ob01302e
日期:——
of brominating reagents. The electrochemical oxidation of bromide to bromine is a viable strategy to reduce waste by avoiding chemical oxidants. Furthermore, the in situ generation of reactive intermediates minimizes the risk of hazardous reagents. In this work, we investigate the electrochemical generation of bromine from hydrobromic acid in a flow electrochemicalreactor. Various alkenes could be converted