Three kinds of NiII complexes, the singly hydroxo‐bridged complex 2, doubly hydroxo‐bridged complexes 3a and 3b, and dinuclear Ni complex 4, were readily prepared from reactions of the salt K[(BBN)BpR] {(BBN)BpR = (9‐BBN)bis(pyrazolyl)borate} and the NiCl2(PPh3)2 precursor via B–N bond cleavage process in dichloromethane or toluene. Complex 2 is a rare example of partial hydrolysis of the coordinated pyrazolylborate ligand, while complexes 3a and 3b demonstrate the unreported new form that complete hydrolyses of the coordinated pyrazolylborate ligand produced. Different mechanisms for the formation of complexes 2–4 are proposed.
A series of new copper(I) complexeshave been synthesized and fully characterized. Single crystal studies of these complexes showed weak intramolecular CÀ H⋅⋅⋅Cu interactions which can be assigned as agostic or anagostic interactions. Their catalytic application in carbene insertion into NÀ H and BÀ H bonds demonstrates wide substrate scope, high yields and selectivity.
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