26976-70-5Relevant articles and documents
Study of selectivity of metal phosphates and phosphonates in Baeyer-Villiger oxidations
Rocha, Graca M. S. R. O.,Santos, Teresa M.,Bispo, Claudia S. S.
, p. 100 - 110 (2011)
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.
