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Variations in the composition of polymetallic oxide system V2O5-CuO are found to be accompanied by a gradual change in electrochemical properties. Average discharge voltage of copper vanadates 2CuO-V2O5 and 4CuO-V2O5 is higher than that of V2O5. The depth of electroreduction of 2CuO-V2O5,3CuO-V2O5, and 4CuO-V2O5 is, respectively, 3.32, 3.0, and 2.7 electrons per mole of vanadium, which is almost twice that of V2O5.  相似文献   
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Kinetics and Catalysis - Flash photolysis of aromatic azides 4-R–C6H4N3 (where R = Ph, OPh, CH2Ph) in aerated acetonitrile solutions led to the intermediate formation of cis and trans isomers...  相似文献   
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Modification of tetramethylcalix[4]resorcinol with dimethylaminomethyl and 3,5-di-tert-butyl-4-hydroxybenzyl fragments was studied. The antioxidative activity of these macrocyclic stabilizers in rubber stocks based on butadiene-acrylonitrile rubber was examined.  相似文献   
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An experimental rate constant data array (>50 values) for the reactions of the sulfate radical anion with the C-H bonds of various organic compounds is analyzed by Denisov’s intersecting parabolas method. The data array is divided into the following four groups according to the type of the C-H bond attacked and the br e value: compounds with primary C-H bonds (br e = 13.14 ± 0.17), compounds with secondary C-H bonds remote from the polar groups (br e = 12.64 ± 0.34), compounds with secondary α-C-H bonds (br e = 13.28 ± 0.24), and compounds with tertiary C-H bonds. It is demonstrated by DFT calculations that the rate constant of the reaction SO 4 ·? + RH is determined by nonspecific solvation and by the ion-dipole interaction in the transition state of the reaction.  相似文献   
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Kinetics and Catalysis - The kinetics of reaction of phenylnitroso oxide and a number of its para-substituted analogues (R = Me2N, MeO, Me, and Br) with tetracyanoethylene in acetonitrile...  相似文献   
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Kinetics and Catalysis - The kinetics of the reaction of phenylnitroso oxide, para-CH3-, para-CH3O-, and para-Br-phenylnitroso oxides with benzoquinones in acetonitrile at room temperature was...  相似文献   
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Upper-rim modification of tetramethylcalix[4]resorcinolarene with 3,5-di-tert-butyl-4-hydroxybenzyl fragments is accompanied by unusual decomposition of the macroring in the modified product with formation of 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)resorcinol.  相似文献   
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