84495-36-3Relevant academic research and scientific papers
Borane-catalysed dinitrogen borylation by 1,3-B-H bond addition
Coffinet, Ana?s,Zhang, Dan,Vendier, Laure,Bontemps, Sébastien,Simonneau, Antoine
, p. 5582 - 5589 (2021)
The borylation of ligated dinitrogen by 1,3-B-H bond addition over a W-N-N unit using various hydroboranes has been examined. In a previous study, we have shown that Piers’ borane (1) reacted with the tungsten dinitrogen complex2to afford a boryldiazenido-hydrido-tungsten species. The ease and mildness of this reaction have encouraged us to extend its scope, with the working hypothesis that1could potentially catalyse the 1,3-B-H bond addition of other hydroboranes. Under productive reaction conditions, dicyclohexylborane (HBCy2) and diisopinocampheylborane (HBIpc2) underwent retro-hydroboration to give cyclohexylborane (H2BCy) or isopinocampheylborane (H2BIpc), respectively; these monoalkylboranes act as N2-borylating agents in the presence of a catalytic amount of1. Under similar conditions, 9-borabicyclononane (9-BBN) slowly adds over the W-N-N unit without rearrangement to a monoalkylborane. Catecholborane (HBcat) undergoes the 1,3-B-H bond addition without the need for a catalyst. We were not able to build more than one covalent B-N bond between the terminal N of the N2ligand and the boron reagent with this methodology.
