Abstract
A new synthesis of hydroxytriarylmethane derived from the reaction of 2-sulfobenzoic anhydride and phenols in the presence of heteropolyacids as green, reusable, and efficient catalyst (using catalytic amount) under ultrasonic irradiation is reported in this paper.
Highlights
Triarylmethanes (TAMs) are highly colored materials and have been used as dyes and pigments for a very long time [1]. ey have received much attention and have been widely used for many purposes such as for photochromic agents [2], protective groups [3], building blocks for dendrimers and NLOs [4, 5]
An efficient synthesis of unsymmetrical triarylmethanes has been reported by Friedel-Cra s reaction of aromatic nucleophiles with heteroarylcarbinols [12]
Werbel et al have reported a facile method for the synthesizing of triarylmethane by the catalytic hydrogenation of the diaryl ketone and the subsequent treatment of the carbinol with aryl amines and HCl [13]
Summary
Triarylmethanes (TAMs) are highly colored materials and have been used as dyes and pigments for a very long time [1]. ey have received much attention and have been widely used for many purposes such as for photochromic agents [2], protective groups [3], building blocks for dendrimers and NLOs [4, 5]. Two basic methods to synthesize triarylmethanes (TAMs) are the Grignard reaction of various carbonyl compounds like benzophenone and methyl benzoate, and the aromatic electrophilic substitution reaction in acidic media [8, 9]. Werbel et al have reported a facile method for the synthesizing of triarylmethane by the catalytic hydrogenation of the diaryl ketone and the subsequent treatment of the carbinol with aryl amines and HCl [13]. Solid HPAs have attracted much attention in organic synthesizing owing to easy workup procedures, easy ltration, and minimization of cost and waste generation because of reusing and recycling of the catalysts [14, 15].
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