Abstract
Metal-ligand cooperation (MLC) plays an impor- tant role in catalysis. Systems reported so far are generally based on a single mode of MLC. We report here a system with potential for MLC by both amine-amide and aromati- zation-dearomatization ligand transformations, based on a new class of phosphino-pyridyl ruthenium pincer com- plexes, bearing sec-amine coordination. These pincer com- plexes are effective catalysts under unprecedented mild conditions for acceptorless dehydrogenative coupling of alcohols to esters at 358C and hydrogenation of esters at room temperature and 5 atm H2. The likely actual catalyst, a novel, crystallographically characterized monoanionic de-aromatized enamido-Ru II complex, was obtained by deprotonation of both the NH and the methylene proton of the N-arm of the pincer ligand.
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