The homogeneous transfer hydrogenation of benzonitrile with 2-propanol or 1,4-butanediol produced -benzylidene benzylamine (BBA, 85% yield) using 5 mol % [Ni(COD)] as a catalytic precursor and a mixture of CyP(CH)PCy and CyP(CH)P(O)Cy as ancillary ligands, under mild reaction conditions (120 °C, 96 h, tetrahydrofuran). 1,4-Butanediol performed better than 2-propanol as a hydrogen donor and yielded γ-butyrolactone as the product of transfer dehydrogenation. Selectivity toward dibenzylamine (DBA, 62% yield) was achieved by varying the amount of 1,4-butanediol in the catalytic system. A reaction mechanism was proposed, involving a ligand-assisted O-H bond activation, end-on substrate coordination, and a key dihydrido-Ni(II) intermediate, leading to the in situ formation of primary imines and amines to ultimately yield the secondary imines observed.
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| http://dx.doi.org/10.1021/acsomega.7b00545 | DOI Listing |
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