The FeBr 3 -Catalyzed Transfer Hydrogenation of Styrene Derivatives under Mild Reaction Conditions

The transfer hydrogenation of alkenes was realized by using a simple transition-metal compound (FeBr3) and 1,4-cyclohexadiene(1,4-CHD) as the hydrogen donor. The conversion of a number of di-and trisubstituted alkenes was investigated, and even a tetra substitut edalkene was successfully converted. Compared with previously published work with the more expensive InBr3, the reaction times were consider-ably reduced and significantly milder reaction conditions could be applied. Interestingly, a transformation that was catalytic in 1,4-CHD, with molecular hydrogen as a stoichiometric reducing agent at 1 bar, was also accomplished