- Study of selectivity of metal phosphates and phosphonates in Baeyer-Villiger oxidations
-
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.
- Rocha, Graca M. S. R. O.,Santos, Teresa M.,Bispo, Claudia S. S.
-
experimental part
p. 100 - 110
(2011/10/05)
-
- Supported sulfonic acid as green and efficient catalyst for Baeyer-Villiger oxidation with 30% aqueous hydrogen peroxide
-
Silica-supported propylsulfonic acid is a very good heterogeneous catalyst for the Baeyer-Villiger oxidation of cyclic ketones to lactones with stoichiometric 30% aqueous hydrogen peroxide in 1,1,1,3,3,3-hexafluoro-2- propanol as solvent.
- Piscopo, Calogero G.,Loebbecke, Stefan,Maggi, Raimondo,Sartori, Giovanni
-
experimental part
p. 1625 - 1629
(2010/10/01)
-
- Synthesis and antimalarial activities of novel 3,3,6,6-tetraalkyl-1,2,4,5-tetraoxanes
-
The oxidative system H2O2/fluorinated alcohol (TFE, HFIP) was used for direct acid- and MeReO3-catalyzed synthesis of 1,2,4,5-tetraoxanes from cyclic (C6, C7, and C12) and acyclic ketones. The influence of ring size and alkyl chain length were studied and antimalarial activities of synthetic 3,3,6,6-tetraalkyl-1,2,4,5-tetraoxanes were determined. Variations in their antimalarial activities were significant, although they share similar electrochemical properties of the peroxide bond.
- Zmitek, Katja,Stavber, Stojan,Zupan, Marko,Bonnet-Delpon, Daniele,Charneau, Sebastien,Grellier, Phillipe,Iskra, Jernej
-
p. 7790 - 7795
(2007/10/03)
-
- Dispiro-1,2,4-trioxolanes by Ozonolysis of Cycloalkylidenecycloalkanes on Polyethylene
-
Ozonolyses of symmetrical (1b-d) and of unsymmetrical cycloalkylidenecycloalkanes (8a, b) afforded the dispiro-1,2,4-trioxolanes 4b-d and 9a, b, respectively.Their thermal decompositions gave mixtures of the cyclic ketones (3) and lactones (6).Photolysis afforded in addition to 3 and 6 the cyclic anhydrides 13, which are isomeric with the corresponding disoiro-1,2,4-trioxolanes.
- Griesbaum, Karl,Krieger-Beck, Petra,Beck, Johannes
-
p. 391 - 396
(2007/10/02)
-