Ethylene and Cyclohexene Oxidation by p-Benzoquinone, Hydrogen Peroxide,and Oxygen in the Solutions of Cationic Pd(II) Complexes in Acetonitrile–Waterand Ionic Liquid–Water Binary Solvents
<sec> —Optimal conditions are selected for ethylene and cyclohexene oxidation reactions in the acetonitrile (AN)–water system in the presence of ${\text{Pd}}{{({\text{AN}})}_{x}}({{{\text{H}}}_{2}}{\text{O}})_{{4 - x}}{{2 + }}$ complexes. It is shown that hydrogen peroxide oxidizes hydroquinone (QН<sub>2</sub>) in acetonitrile solutions and in ionic liquids (${\text{BMI}}{{{\text{M}}}{ + }}{\text{BF}}_{4}{ - },$${\text{BMI}}{{{\text{M}}}{ + }}{\text{PF}}_{6}{ - }$), and the rates of ethylene oxidation in the ${\text{BMI}}{{{\text{M}}}{ + }}{\text{PF}}_{6}{ - }$ ionic liquid in the presence of p-benzoquinone (Q) and hydroquinone are the same. It is shown that solid and soluble phthalocyanine iron complexes catalyze oxidation of olefins by oxygen in acidic acetonitrile media by converting p-benzoquinone to the third catalyst of the process. The apparent first-order rate constants of hydroquinone oxidation by oxygen are determined. The use of the IL–Н<sub>2</sub>О–Н<sub>2</sub>SO<sub>4</sub> system is found to be inappropriate for cyclohexanone synthesis because of the formation of byproducts of cyclohexene conversion. </sec>