Catalysis Letters p. 100 - 110 (2011)
Update date:2022-08-04
Topics:
Rocha, Graca M. S. R. O.
Santos, Teresa M.
Bispo, Claudia S. S.
Layered materials including metal phosphates and phosphonates have been widely investigated in several fields acting as good selective catalysts in a great number of oxidative reactions. Zirconium phosphate amorphous [Zr(HPO 4)2?H2O; ZrPA], sodium exchanged zirconium phosphate amorphous [Zr(NaPO4)2; NaZrPA], potassium exchanged zirconium phosphate amorphous [Zr(KPO4)2; KZrPA], zirconium phenylphosphonate amorphous [Zr(O3PC 6H5)2; ZrPPA], zirconium carboxyethylphosphonate [Zr(O3PCH2CH2COOH) 2; ZrCEP] and aluminium carboxyethylphosphonate [Al 3(OH)3(O3PCH2CH2CO 2)2?3H2O; AlCEP] were prepared, characterized and evaluated as selective catalysts in the Baeyer-Villiger oxidation of cyclopentanone, p-methoxybenzaldehyde and 2,4,6- trimethylbenzaldehyde by hydrogen peroxide, in acetic acid. The selectivity of δ-valerolactone, p-methoxyphenol and 2,4,6-trimethylphenol have been found to be strongly related with the properties and structure of each catalyst. Graphical Abstract: The selectivity of zirconium phosphate amorphous [Zr(HPO4)2?H2O; ZrPA], sodium exchanged zirconium phosphate amorphous [Zr(NaPO4)2; NaZrPA], potassium exchanged zirconium phosphate amorphous [Zr(KPO4) 2; KZrPA], zirconium phenylphosphonate amorphous [Zr(O 3PC6H5)2; ZrPPA], zirconium carboxyethylphosphonate [Zr(O3PCH2CH2COOH) 2; ZrCEP] and aluminium carboxyethylphosphonate [Al 3(OH)3(O3PCH2CH2CO 2)2?3H2O; AlCEP] was evaluated in the Baeyer-Villiger oxidation of cyclopentanone, p-methoxybenzaldehyde and 2,4,6-trimethylbenzaldehyde by hydrogen peroxide, in acetic acid. Different selectivities have been found which were correlated with the properties and structure of each compound.
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