Junichi Uenishi developed a selective route from gem-dibromoalkenes to geometrically pure (Z)-bromoalkenes. The palladium-catalysed hydrogenolysis removes one bromine substituent while controlling the geometry of the remaining carbon–carbon double bond.[ref]
A general and convenient synthetic method of geometrically pure (Z)-1-bromo-1-alkenes by Junichi Uenishi and others. 1996, pp.6759–6762: selective palladium-catalysed hydrogenolysis
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