Rapid and Efficient Synthesis of Hydroxytriarylmethanes under Ultra Sonic Irradiation Using Keggin Heteropolyacids and Preyssler Catalysts in Green Conditions

Table 3

Recyclability of H₁₄[NaP₅W₃₀O₁₁₀].

Entry	Phenol	Yield (%)^a/Run
		1	2	3	4	5	6
1	phenol	95	93	90	88	86	84
2	m-cresol	96	93	91	88	86	85
3	o-cresol	95	92	91	89	87	84
4	2-bromophenol	93	90	87	86	84	82
5	2-Chlorophenol	94	91	90	88	85	83
6	2,6-dibromophenol	94	92	89	87	86	85

^aIsolated yields.