Relationships between the efficiency of cyclohexane oxidation and the electrochemical parameters of the reaction solution

Investigation into experimental conditions and factors for cyclohexane oxidation with VO(acac)2

“…VO(acac) 2 exhibits the best catalytic activity with TON of 15 and 48 for CyO and CyOH, respectively. The total TONs decrease in the order of VO(acac) 2 >V 2 (SO 4 ) 3 >VOSO 4 >VOC 2 O 4 , indicating that VO(acac) 2 is the best starting material that can be used as the catalyst for Cy oxidation, which is consistent with those reported in the literatures [1,14,16] . Therefore, VO(acac) 2 was chosen to act as a potential catalyst in the Cy oxidation and the effects of the reaction parameters were discussed in detail in the following sections.…”

“…We have recently informed that some starting materials of V complexes are active for the hydrocarbon oxidations, such as VO(acac) 2 [1,2,[14][15][16] , V 2 O 5 [1,14] and NaVO 3 [1,16] etc. The catalytic activities of some other starting materials compared with VO(acac) 2 are shown in Table 1.…”

“…They are important reagents to produce adipic acid and caprolactam, which are further used for the manufacture of nylon [1,2] . To achieve a good activity, efforts have been devoted to searching for more active catalysts under mild conditions.…”

“…Moreover, starting materials, such as VOSO 4 , VO(acac) 2 , VOC 2 O 4 , V 2 (SO 4 ) 3 , are also used as catalysts for alkane oxidation due to their chemical stabilities and easy preparation [1,2,[14][15][16] . Kobayashi et al [16] reported that VO(acac) 2 functioned efficiently with a TON of 440 over 600 min in the adamantine oxidation.…”

Oxidation of isoeugenol to vanillin by the “H2O2–vanadate–pyrazine-2-carboxylic acid” reagent

“…Vanadium complexes are known as efficient catalysts for various mild oxidations of organic compounds [7][8][9][10][11][12][13][14], particularly, saturated [15][16][17][18][19], aromatic [20][21][22][23] and olefinic [24][25][26][27] hydrocarbons as well as natural products [28][29][30]. In most of these processes, hydrogen peroxide was used as the oxidizing reagent (usually in an air atmosphere); however, the applications of other peroxides, such as tert-butyl hydroperoxide [31,32] and peroxyacetic acid [33], in these oxidations were also described.…”