A series of iron-boryl complexes have been studied using pyrrole-based pincer ligands, RPNP (PNP = anion of 2,5-bis(dialkylphosphinomethyl)pyrrole, R = t-butyl, cyclohexyl). Their chemistry and stability were found to differ based on the substituents present on the ligand backbone as well as on the supporting ligands off the metal center. The nature of these differences was closely probed through stoichiometric reactions and characterization techniques. Their catalytic competency towards hydroboration was initially examined using both internal and terminal alkynes. We also tested the ability of insertion into the Fe-B bond of various substrates and have successfully isolated and fully characterized several novel complexes including some with discrete insertion of alkynes into the Fe-B bond with Bpin and Bcat.

Synthesis and reactivity of iron-boryl pincer complexes

ACS Spring 2022

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