Selective Reduction of Conjugated Ethylenic Linkage in the Presence of Ion-Exchange Resin Bound Borohydride

The use of crosslinked polystyrene anion-exchange resin as a support for borohydride ions made it possible to reduce conjugated olefinic bonds selectively under very mild conditions. The isolation of the reduced products by a simple filtration and evaporation process is another interesting feature of this reaction.