Abstract

KHAZAEI, Ardeshir et al. Highly efficient method for solvent-free synthesis of diarylmethane and triarylmethane from benzylic alcohols using P₂O₅/Al₂O₃ or P₂O₅/SiO₂ at room temperature. S.Afr.j.chem. (Online) [online]. 2011, vol.64, pp.120-126. ISSN 1996-840X.

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.

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