Monomeric diisopropylaminoborane (H₂BN(iPr)₂) promotes the reduction of a variety of nitriles to their corresponding primary amines in good yields and purity.  Diisopropylaminoborane was generated in situ from lithium diisopropylaminoborohydride (LiH₃BN(iPr)₂) and methyl iodide.  It should be pointed out that lithium diisopropylaminoborohydride itself does not reduce nitriles at room temperature.