Unexpected formation of nitroso-chelated cyclic η1-acylruthe-nium(II) complex, an effective catalysts for transfer hydrogenation reaction

Publication date: Available online 2 February 2018 Source:Journal of Organometallic Chemistry Author(s): Nirmalya Mukherjee, Rafał Gawin, Stefan Czarnocki, Roman Gajda, Maura Malińska, Krzysztof Woźniak, Anna Kajetanowicz, Grela Karol Reaction of commercial ruthenium complexes M31 and M20 with 2-nitrostyrene gave a new nitroso-chelated cyclic η1-acyl ruthenium(II) complexes Ru-4 and Ru-6 respectively instead of expected Hoveyda-Grubbs type (pre)catalyst Ru-3. New complexes were characterized by means of standard analytical techniques and their crystallographic structure has been confirmed by X-ray structural analysis. It was found that Ru-4 and Ru-6 do not exhibit any activity in standard metathesis reactions. However, a dramatic increase of activity was observed upon treatment with (trimethylsilyl)diazomethane, allowed for the successful application of Ru-4 in ROMP of endo,exo-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid dimethyl ester. Moreover, such complexes can be effective catalysts of transfer hydrogenation of ketones as well as cycloisomerization reactions. Graphical abstract

Source: Journal of Organometallic Chemistry - February 2, 2018 Category: Chemistry Source Type: research