Acid-assisted hydrogenation of CO2 to methanol using Ru(ii) and Rh(iii) RAPTA-type catalysts under mild conditions

Abstract

A highly efficient homogeneous catalyst system for production of CH₃OH from CO₂ using single molecular defined ruthenium and rhodium RAPTA-type catalysts [Ru(η⁶-p-cymene)X₂(PTA)] (X = I(1), Cl(2); PTA = 1,3,5-triaza-7-phosphaadamantane) and rhodium catalysts [Rh(η⁵-C₅Me₅)X₂(PTA/PTA-BH₃)] (X = Cl(3), H(4) and PTA-BH₃, H(5)) developed in acidic media under mild conditions. A TON of 4752 is achieved using a [Ru(η⁶-p-cymene)I₂(PTA)] catalyst which represents the first example of CO₂ hydrogenation to CH₃OH using single molecular defined Ru and Rh RAPTA-type catalysts.