Zinc borohydride is an inorganic compound with the formula Zn(BH₄)₂. It is typically encountered as a white to off-white powder or as a solution in ethers such as tetrahydrofuran (THF). It is a powerful and versatile reducing agent, known for its high reactivity and selectivity. Its primary application is in organic synthesis as a selective reducing agent. It is particularly valued for its ability to reduce aldehydes and ketones to alcohols, often with chemoselectivity over other reducible functional groups like esters or nitriles. Compared to sodium borohydride, zinc borohydride can exhibit different stereoselectivity in certain reductions, making it a useful tool in synthetic chemistry. It is also employed in the reduction of imines and in some specialized dehalogenation or desulfurization reactions. As a reagent, it must be handled with care under inert atmosphere (e.g., nitrogen or argon) due to its sensitivity to moisture and air, which can lead to decomposition and generation of flammable hydrogen gas. It is commercially available but is often prepared *in situ* from zinc chloride and sodium borohydride for laboratory use.