(Caffeine) (tetrahydroborato)zinc Complex [Zn(BH4)2(caf)]: A New Stable and Efficient Reducing Agent

In this context, (Caffeine)(tetrahydroborato)zinc complex as white stable reducing agents [Zn(BH4)2(caf)], has been prepared by complexation of oneequimolar amounts of zinc tetrahydroborate and one equimolar amounts of caffeine at room temperature. Also, [Zn(BH4)2(caf)]has been used for reduce of a variety of carbonyl compounds such as aldehydes, ketones, α, β-unsaturated carbonyl compounds, acyloins and a-diketones to their corresponding alcohols in excellent yields (90-95%). The reduction reactions have been completed in appropriate times (30-90 min) by using of 0.5-1 equivalents of [Zn(BH4)2(caf)] in CH3CN at room temperature or under reflux conditions.