2.1 Catalytic hydroboration of nitriles. We initiated our research with the hydroboration of nitriles. Optimization of reaction parameters was conducted using benzonitrile as the model substrate. Several reaction variables were screened to optimize product yield: catalyst loading, temperature, and solvent. Ultimately, employing benzene as the reaction solvent with 1 mol% catalyst loading at 50 °C afforded the cleanly converted amine product (3d, 95%) within 3 hours. Encouraged by the successful use of complex A as a suitable pre-catalyst for benzonitrile reduction, we explored more nitrile substrates. The substrate range included compounds with electron-donating and electronwithdrawing groups, as well as those with heteroatoms and sterically hindered groups (Scheme 1). Simple aliphatic nitriles were reduced in high isolated yields within 3 hours (3a, 3b), whereas the slightly more sterically hindered cyclohexanecarbonitrile required longer reaction times (5 hours) to give 3c in 79% yield. Benzonitrile and derivatives containing electron-donating and withdrawing groups were reduced to the corresponding diborylamine in good to excellent yields within 3 hours, except for the meta-trifluoromethylphenyl derivative (3j), which required a reaction time of 4 hours to achieve 86% yield. Heterocyclic aromatic substrates were also explored, indole 3k was reduced readily in 3 hours giving good isolatable yields, i.e. 91%, however, 2-furonitrile took 6 hours to produce a moderate yield of 67% 3I.