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Aminotriazole Mn(I) Complexes as Effective Catalysts for Transfer Hydrogenation of Ketones
Oriol Martínez-Ferraté1,2, Christophe Werlé1, Giancarlo Franciò2
1Max Planck Institute for Chemical Energy Conversion Stiftstr. 34-36 Mülheim an der Ruhr 45470 Germany.
Abstract:
A catalytic system based on complexes comprising abundant and cheap manganese together with readily available aminotriazole ligands is reported. The new Mn(I) complexes are catalytically competent in transfer hydrogenation of ketones with 2-propanol as hydrogen source. The reaction proceeds under mild conditions at 80 °C for 20 h with 3 % of catalyst loading using either KO Bu or NaOH as base. Good to excellent yields were obtained for a wide substrate scope with broad functional group tolerance. The obtained results by varying the substitution pattern of the ligand are consistent with an out-sphere mechanism for the H-transfer.
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