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Abstract Cure kinetics of epoxy resin E51/MP/methyltetrahydrophthalic anhydride (MeTHPA)/ 2-ethyl-4-methyl-imidazole (2,4-EMI) flame retardant composite were studied using the dynamical tortional vibration method. The influence of MP loadings on The cure showed has improved studied were well. The results showed that the rate of cure reactions depended distinctly on the cure temperature. At low MP loadings, the gelation time t g for the systems did Not change obviously while at higher MP loading (higher than 20 phr) t …
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Chemistry in the news – Abstract The oxidation of oxalic acid by the potassium tetrabromoaurate(III) in 0.005≤ [H2C2O4]≤0.07 mol dm-3 is studied by UV spectrophotometry in the temperature range of 293.2 – 313.2 K. Under pseudo-first-order conditions ([H2C2O4]0 ≥10[Au(III)]0), it is first order in [Au(III)] and [H2C2O4]. Both H+and Br– retard the reaction. The reactive species for Au(III) is AuBr3(H2O). …
Abstract for news about chemistry – The kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol(IBA) by cerium(IV) in sulfuric acid media has been investigated by titrimetric technique of redox in the temperature range of 298-313K. It is found that the reaction is first-order with respect to Ce(IV) and Ru(III), and a positive fractional order with respect to IBA. It is found that the pseudo first-order ([IBA]>>[Ce(IV)]>>[Ru(III)]) rate constant kobs increases with the increase of [H+] but decreases with the increase of [HSO4–]. Under the protection of nitrogen, the reaction system can not initiate polymerization of acrylonitrile, indicating generation of free radicals. On the basis of the experimental results, a suitable mechanism has been proposed. The rate constants of the rate determining step together with the activation parameters were evaluated.
Keywords Ruthenium(III) ion; Cerium(IV) ion; Isobutyl alcohol(IBA); Catalytic Oxidization; Kinetics and mechanism
Zang Hongjun, Li Jitai#, Bian Yanjiang#, Li Tongshuang#
(Research Institute of Elemento-organic Chemistry, Key Labortary of Elemento-organic Chemistry, Nankai University, Tianjin.300071; #College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China)
Received Sep.28, 2002. The project was supported by NSFC (29872011), Educational Ministry of China and Educational Department of Hebei Province; Natural Science Foundation of Hebei Province supported the project.
Abstract The coupling reaction of aromatic aldehydes leading to pinacols were carried out by using Zn/montmorillonite K10-ZnCl2 in 50% aqueous THF under ultrasound with 23-87% yield.
Keywords pinacolization, aromatic aldehyde, ultrasound
1,2–Diols are very useful synthons for a variety of organic syntheses. They can be used as intermediates for the preparation of ketones and alkenes. More importantly, the pinacol coupling has been applied to the synthesis of biologically active natural compounds.