In 2019,Journal of the American Chemical Society included an article by Ghosh, Chandrani; Kim, Suyeon; Mena, Matthew R.; Kim, Jun-Hyeong; Pal, Raja; Rock, Christopher L.; Groy, Thomas L.; Baik, Mu-Hyun; Trovitch, Ryan J.. Formula: C7H4FN. The article was titled 《Efficient Cobalt Catalyst for Ambient-Temperature Nitrile Dihydroboration, the Elucidation of a Chelate-Assisted Borylation Mechanism, and a New Synthetic Route to Amides》. The information in the text is summarized as follows:
N,N-Diborylamines have emerged as promising reagents in organic synthesis; however, their efficient preparation and full synthetic utility have yet to be realized. To address both shortcomings, an effective catalyst for nitrile dihydroboration was sought. Heating CoCl2 in the presence of PyEtPDI afforded the six-coordinate Co(II) salt, [(PyEtPDI)CoCl][Cl]. Upon adding 2 equiv of NaEt3BH, hydride transfer to one chelate imine functionality was observed, giving (κ4-N,N,N,N-PyEtIPCHMeNEtPy)Co. Single-crystal x-ray diffraction and d. functional theory calculations revealed that this compound possesses a low-spin Co(II) ground state featuring antiferromagnetic coupling to a singly reduced imino(pyridine) moiety. Importantly, (κ4-N,N,N,N-PyEtIPCHMeNEtPy)Co was found to catalyze the dihydroboration of nitriles using HBPin with turnover frequencies of up to 380 h-1 at ambient temperature Stoichiometric addition experiments revealed that HBPin adds across the Co-Namide bond to generate a hydride intermediate that can react with addnl. HBPin or nitriles. Computational evaluation of the reaction coordinate revealed that the B-H addition and nitrile insertion steps occur on the antiferromagnetically coupled triplet spin manifold. Formation of the borylimine intermediate occurs following BPin transfer from the borylated chelate arm to regenerate (κ4-N,N,N,N-PyEtIPCHMeNEtPy)Co. Borylimine reduction is in turn facile and follows the same ligand-assisted borylation pathway. The independent hydroboration of alkyl and aryl imines was also demonstrated at 25°. With N,N-diborylamines in hand, their addition to carboxylic acids allowed for the direct synthesis of amides at 120°, without the need for an exogenous coupling reagent. The experimental part of the paper was very detailed, including the reaction process of 4-Fluorobenzonitrile(cas: 1194-02-1Formula: C7H4FN)
4-Fluorobenzonitrile(cas: 1194-02-1) is used as chemical intermediate, solvent for perfumes and pharmaceuticals, stabilizer for chlorinated solvents, HPLC analysis, catalyst and component of transition-metal complex catalysts.Formula: C7H4FN
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts