Catalytic properties of heteropoly compounds in 1,3-butadiene oxidation with hydrogen peroxide

The primary stages of polyoxomolybdate catalyzed cyclohexanone oxidation by hydrogen peroxide as investigated by in situ NMR. Substrate activation and evolution of the working catalyst

“…PW 3 , and PW 2 respectively. These latter showed peaks at 3.5, ~2, and 0.4 ppm in acetonitrile solutions[51]. Such results are fully consistent with progressive decomposition of the Keggin POM in presence of hydrogen peroxide and formation of novel peroxo complexes as discussed in the literature[24,53,55].…”

“…3 , and PW 2 respectively[48,49,51,52]. Such species are known to play a key role in many oxidation reactions of organic substrates[53,54].…”

Transition metal-substituted Keggin-type polyoxometalates as catalysts for adipic acid production

“…These peroxo species were reported by several authors as the active species in the formation of oxygenated compounds. They were evidenced by multinuclear NMR spectroscopies in the cases of H 3 [2,21].…”

“…In the second step, the addition of hydrogen peroxide led to a POM color change from blue to yellow that is attributed to the POMred oxidation. It was reported that in the presence of hydrogen peroxide, peroxo species such as {PO 4 [2,21]. This step can be explained by the following equation: During the 20 h of reaction, the peroxo-POM species will react with some products from the Eq.…”