A theoretical study of asymmetric ketone hydrogenation catalyzed by Mn complexes: from the catalytic mechanism to the catalyst design. Issue 21 (24th May 2022)

• Record Type: Journal Article
• Authors: Zhao, Yaqi; Zhang, Lin; Tang, Yanhui; Pu, Min; Lei, Ming
• Is Part Of: Physical chemistry chemical physics. Volume 24:Issue 21(2022)
• Page Start: 13365
• Page End: 13375
• Publication Date: 2022-05-24
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d2cp00818a
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A DFT study was performed to investigate asymmetric ketone hydrogenation catalyzed by Mn pincer complexes which has potentially high catalytic activity. This work may shed light on the design of cheap metal catalysts with new ligand frameworks. Abstract : Herein, a density functional theory (DFT) study was performed to investigate asymmetric ketone hydrogenation (AKH) catalyzed by Mn complexes, from the catalytic mechanism to the catalyst design. The calculated results indicated that the Mn(CO)2 –PSiNSiP (A1, PSiNSiP = P(Ph)2 Si(CH3 )2 NSi(CH3 )2 P(Ph)2 ) pincer complex has potential high catalytic activity for ketone hydrogenation. The Mn(CO)–LYB (B, LYB = P(Ph)2 Si(CH3 )2 NSi(CH3 )2 P(Me)2 ) pincer complex was then designed to catalyze AKH with good stereoselectivity. The hydrogen transfer (HT) step is the chirality-determining step. To avoid the enantiomer of Mn(CO)2 –LYB, which could eliminate the high stereoselectivity during AKH, novel Mn complexes with quadridentate ligands, such as Mn(CO)–LYC (C, LYC = P(CH3 )2 CH2 Si(CH3 )NSi(CH3 )(Si(CH3 )CH2 P(CH3 )2 )CH2 P(Ph)2 ) and Mn(CO)–LYD (D, LYD = P(CH3 )2 CH2 Si(CH3 )NSi(CH3 )(Si(CH3 )CH2 P(CH3 )2 )CH2 P(Cy)2 ), were designed to drive AKH with medium stereoselectivity. In order to increase the stereoselectivity of AKH, Mn(CO)–LYE (E, LYE = PH2 CH2 Si(CH3 )NSi(CH3 )(Si(CH3 )CH2 P(CH3 )2 )CH2 P(Ph)2 ) and Mn(CO)–LYF (F, LYF = PH2 CH2 Si(CH3 )NSi(CH3 )(Si(CH3 )CH2 P(CH3 )2 )CH2 P(Cy)2 ) were further designed and showed very good stereoselectivity, which is due to the lower deformation energy and stronger interactions between the ketone substrates and catalysts. This work may shed light on the design of cheap metal catalysts with a new ligand framework for the asymmetric hydrogenation (AH) of CX bonds (X = O, N).