Acyclic diaminocarbene complexes of palladium obtained by intermolecular hydroamination of a metal bound isonitrile moiety using secondary amines

Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India E-mail: pghosh@chem.iitb.ac.in Fax: 91-22-25723480 Department of Chemistry, Howard University, Washington DC 20059, USA Manuscript received 28 June 2018, accepted 11 July 2018 A series of palladium complexes supported over acyclic diaminocarbene (ADC) ligands were conveniently obtained by the hydroamination of a metal bound isonitrile moiety. In particular, the hydroamination reaction using various secondary amines namely, pyrrolidine, morpholine and piperidene on a palladium isonitrile derivative, cis-[(2,6-i-Pr2C6H3)NC]2PdCl2, yielded the desired palladium acyclic diaminocarbene (ADC) complexes of the type, cis-[(R1NH)(R2)methylidene]PdCl2(CNR1) [R1 = 2,6- i-Pr2C6H3: R2 = NC4H8 (1); NC4H8O (2); NC5H10 (3)], under ambient reaction conditions in moderate to good yields (ca. 68– 73%). The structural characterization of the palladium complexes (1-3) attested to the formation of the metal bound acyclic diaminocarbene ligand via an intermolecular hydroamination reaction on the metal bound isonitrile moiety in a palladium pre­cursor complex. &nbsp