 The conversion of phenols through cleavage of their strong C(sp2)–OH bonds remains one of the most challenging tasks in synthetic chemistry. In this regard, the hydrogenolysis of phenols to yield arenes is of great importance in fine chemical synthesis and bio-refinery. However, due to the strong C(sp2)–OH bond (bond dissociation energy = 111 kcal/mol for phenol), energy-consuming harsh conditions, either high reaction temperatures (typically > 200 ℃)or pressures, are generally needed to achieve high conversion and selectivity for the hydrogenolysis of phenols. Hence, these reported procedures generally tend to have a limited substrate scope.
 Herein, we report a novel Al(PO3)3-supported Pt nanoparticles for the selective hydrogenolysis of a broad range of phenols (including sterically highly demanding phenols and lignin model compounds) to afford arenes under mild conditions (<150 ℃, Ar/H2= 9/1 (1 atm)). The catalyst was truly heterogeneous and could be reused several times. Our strategy to activate the strong C(sp2)–OH bond involves the tentative formation of phenyl phosphate species on the catalyst surface by the surface reaction of phenols with Al(PO3)3. Preliminary studies suggested that the metal-support cooperation and a low hydrogen partial pressure are key to achieving the observed selective hydrogenolysis.

Selective Hydrogenolysis of Phenols to Arenes by Aluminum Metaphosphate-Supported Platinum Nanoparticles

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