Preparation, characterization, and catalytic application of nano Ag/ZnO in the oxidation of benzylic C–H bonds in sustainable media

Abstract

Nano Ag/ZnO as a heterogeneous catalyst for the oxidation of benzylic C–H bonds in air was demonstrated.

Oxidation of ethylbenzene to styrene oxide in the presence of cellulose‐supported Pd magnetic nanoparticles

“…So, the oxidation of ethylbenzene (1) with H 2 O 2 was investigated for the optimization of reaction conditions. It is found that [11][12][13] are the best reaction conditions for the oxidation of ethylbenzene. Oxidation of ethylbenzene proceeds to give styrene oxide (2) as the sole product in 88% yield in short reaction duration (24 h) without any byproduct.…”

“…After screening a variety of solvents, H 2 O-EtOH (3:1) is determined to be the best solvent (Table 1, entries 6-10). Temperature is an important factor for this reaction and the yield is decreased at low temperatures ( Table 1, entries [11][12][13]. The reaction was examined under an oxygen atmosphere created with a balloon instead of H 2 O 2 : the reaction does not proceed during 24 h.…”

“…The oxidation reaction of ethylbenzene has attracted a great deal of attention due to the importance of its products. Four main products were observed for the oxidation of ethylbenzene under various reaction conditions (Scheme , products A , B , C and D ) . In most of these works, a mixture of products was reported, so controlling the selectivity in the oxidation of ethylbenzene is very difficult .…”

“…Four main products were observed for the oxidation of ethylbenzene under various reaction conditions (Scheme 1, products A, B, C and D). [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In most of these works, a mixture of products was reported, so controlling the selectivity in the oxidation of ethylbenzene is very difficult. [21] 1-Phenylethanol is the result of a mild oxidation reaction of ethylbenzene which can be oxidized in situ to acetophenone.…”

Synthetic utility of metal catalyzed hydrogen peroxide oxidation of C-H, C-C and C=C bonds in alkanes, arenes and alkenes: Recent advances

“…87,88 The osmium(VI) nitrido complex, [ ZnO-supported Ag nanoparticles efficiently catalyzed the oxidation reactions of of benzylic C-H bonds in alkyl-substituted arenes with H 2 O 2 . 92 Selective oxidation of ethylbenzene using tert-butyl hydroperoxide and H 2 O 2 in the presence of mixed oxide spinels, derived from layered double hydroxides, gave acetophenone. The activity of the catalyst increased in the order MgCuMnAl > MgCoMnAl >> MgMnAl > MgCrAl > CoMnAl oxides.…”