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Published:
Oct 12, 2015Keywords:
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Highly Efficient Method for Solvent-Free Synthesis of Diarylmethane and Triarylmethane from Benzylic Alcohols Using P<sub>2</sub>O<sub>5</sub>/Al<sub>2</sub>O<sub>3</sub> or P<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub> at Room Temperature
Abstract
A highly efficient procedure for the synthesis of triarylmethane and diarylmethane via benzylation of aromatic hydrocarbons from benzyl alcohols using supported P2O5 on SiO2 and/or Al2O3 under solvent-free conditions is described. Excellent yields of triarylmethane and diarylmethane were obtained using P2O5-SiO2 (50% W/W) and/or P2O5-Al2O3 (50% W/W) at room temperature. The reusability of both supported P2O5 on SiO2 and Al2O3 were examined. Both supported reagents show favorable activities in first and second runs, however, a decline in reactivity was observed in following attempts. The reaction is scalable to >0.03 mole amounts.
Keywords: Diarylmethane, triarylmethane, aromatic alcohol, P2O5, silica gel, alumina
