South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
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.