Mild and Selective Carbon Dioxide Hydroboration to Methoxyboranes Catalyzed by Mn(I) PNP Pincer Complexes
Sylwia Kostera, Maurizio Peruzzini, Karl Kirchner, Luca Gonsalvi
Abstract
Abstract Well‐defined Mn(I)‐PNP pincer‐type complexes were tested as non‐precious transition metal catalysts for the selective reduction of CO 2 to boryl‐protected MeOH in the presence of hydroboranes (HBpin, 9‐BBN) and borates as Lewis acids (LA) additives. The best performance was obtained under mild reaction conditions (1 bar CO 2 , 60 °C) in the presence of the hydridocarbonyl complex [MnH(PNP NH – i Pr)(CO) 2 ] and B(OPh) 3 as co‐catalyst. Preliminary mechanistic studies suggest that the initial activation step may occur by cationization of the metal center by the strong LA, and that both metal‐catalyzed and metal‐free steps are present in the overall catalytic system.
Topics & Concepts
Pincer movementHydroborationCatalysisChemistryTransition metalMedicinal chemistryMetalLewis acids and basesSelective reductionInorganic chemistryOrganic chemistryCarbon dioxide utilization in catalysisCO2 Reduction Techniques and CatalystsMetal-Organic Frameworks: Synthesis and Applications