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Catalytic Hydrogenation of Cyclic Carbonates using Manganese Complexes
Author(s) -
Kaithal Akash,
Hölscher Markus,
Leitner Walter
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201808676
Subject(s) - catalysis , methanol , chemistry , manganese , ligand (biochemistry) , stoichiometry , inorganic chemistry , diol , medicinal chemistry , polymer chemistry , organic chemistry , biochemistry , receptor
Catalytic hydrogenation of cyclic carbonates to diols and methanol was achieved using a molecular catalyst based on earth‐abundant manganese. The complex [Mn(CO) 2 (Br)[HN(C 2 H 4 P i Pr 2 ) 2 ] 1 comprising commercially available MACHO ligand is an effective pre‐catalyst operating under relatively mild conditions ( T =120 °C, p (H 2 )=30–60 bar). Upon activation with NaO t Bu, the formation of coordinatively unsaturated complex [Mn(CO) 2 [N(C 2 H 4 P i Pr 2 ) 2 )] 5 was spectroscopically verified, which confirmed a kinetically competent intermediate. With the pre‐activated complex, turnover numbers up to 620 and 400 were achieved for the formation of the diol and methanol, respectively. Stoichiometric reactions under catalytically relevant conditions provide insight into the stepwise reduction form the CO 2 level in carbonates to methanol as final product.