A bidentate boryl ligand: syntheses of platinum and iridium complexes

Abstract

A methylenediphenylphosphine substituted diazaborole was obtained in a two-step procedure in amounts around 4 g. This B-P ligand was coordinated at platinum and iridium and the structures of the boryl complexes are discussed. In the case of the iridium derivative an interesting boron-boron contact was found.

Selective Synthesis of Unsymmetrical Diboryl PtII and Diaminoboryl CuI Complexes by B–B Activation of Unsymmetrical Diboranes(4) {pinB–B[(NR)2C6H4]}

“…A detailed analysis of the coordination chemical properties of the (unsymmetrical) cis ‐diboryl platinum complexes, especially regarding the trans influence and hence the bonding situation (e.g., contribution of σ‐ and π‐bonding, a possible p–p B–B interaction, influence of the ligand backbone) of the boryl ligands has to await more detailed, especially computational, studies 3g,5…”

A Highly Active PBP–Iridium Catalyst for the Dehydrogenation of Dimethylamine–Borane: Catalytic Performance and Mechanism

“…The Ir−B bond length in 6 of 2.138(5) Å is the longest among those of our previously reported (PBP)Ir complexes. It is also longer than a typical Ir−B single bond ( A ) [1.991(6) to 2.12(2) Å], but is shorter than a dative bond from Ir to B atom ( D ) [2.326(11) Å] (Figure ) . Ozerov recently reported a series of iridium complexes possessing a σ‐borane/dihydride ( B ) and borate/dihydride (with some degree of Ir ⋅⋅⋅ B interaction) ( C ) formulation ,.…”

NNB-Type Tridentate Boryl Ligands Enabling a Highly Active Iridium Catalyst for C–H Borylation

“…In many types of stoichiometric and catalytic organometallic reactions, transition metals together with boryl ligands play a very important role as key intermediates [1,2,3,4,5,6,7,8]. Among these reactions, the sp 2 boryl anion can be transferred to the target product from metal complexes, which we usually call a “reactive” ligand; the boron atom acting as a “reactive” boryl anion ligand has much stronger capacity for donating σ-electrons compared with C, N, and O atoms [9,10].…”