Imidazolin-2-iminato ligand supported organozinc complex as Catalyst for Hydroboration of Organic Nitriles

Panda, Tarun K and Das, Suman and Bhattacharjee, Jayeeta (2019) Imidazolin-2-iminato ligand supported organozinc complex as Catalyst for Hydroboration of Organic Nitriles. New Journal of Chemistry. ISSN 1144-0546 (In Press)

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Abstract

The reaction of diethylzinc with imidazolin-2-imines (ImRNH, R = Dipp (2,6-diisopropylphenyl), Mes (2,4,6-trimethylphenyl), tBu (tert-butyl) afforded the corresponding dimeric zinc(II) imidazolin-2-iminato complexes [{(ImRN)Zn(CH2CH3)}2] (R = Dipp, 1a; R = Mes, 1b; R = tBu, 1c). The zinc complexes were characterised using spectroscopic techniques and the molecular structure of complex 1b was established by single-crystal x-ray diffraction analysis. Complex 1c was used as a catalyst for the chemo-selective hydroboration of organic nitriles with pinacolborane (HBpin) at ambient temperature to obtain diborylamines of a broad substrate scope in high yield. Zinc complex 1c exhibits a versatile substrate scope and good functional group tolerance for catalytic hydroboration reactions. A most plausible mechanism is proposed on the basis of the kinetic study.

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