A ruthenium complex bearing an "anti-Bredt" N-heterocyclic carbene was synthesized, characterized and evaluated as a catalyst for olefin metathesis. Good conversions were observed at room temperature for the formation of di- and tri-substituted olefins by ring-closing metathesis. It also allowed for the ring-opening metathesis polymerization of cyclooctadiene, as well as for the cross-metathesi...

Furan is one of the smallest organic compounds with heterocycle ring. With this particular molecular structure, furan considered as a highly toxic and carcinogenic combustion pollutant, may contribute to formation oxygenated soot. In work, pathways from 1,3-butadiene, trans-2-butene cis-2-butene were comprehensively explored. The potential energy surfaces, reaction rate coefficients, thermodyna...

In the title compound, C(15)H(17)N(2) (+)·Br(-), the cyclo-butene and benzene rings are coplanar. The dihedral angle between the benzene and imidazolium rings is 21.2 (3)°. In the crystal structure, the C(15)H(17)N(2) (+) and Br(-) ions are linked into a zigzag chain along the b axis by C-H⋯Br hydrogen bonds, and weak C-H⋯π inter-actions involving the benzene ring of a screw-related cation.

Little attention has been given to the use of ruthenium and osmium as catalysts for vapour-phase reactions. This paper shows that both these metals when supported on alumina possess signijcant activity for the hydrogenation of unsaturated hydrocarbons. In the hydrogenation of butene, butadiene and acetylene their activity is comparable with that shown by the other platinum group metals, althoug...

The aims of this study were to assess the antimicrobial efficacy of the leaf essential oil and the leaf extracts of R. montana against Botrytis cinerea, Fusarium oxysporum, Verticillium dahliae, Aspergillus oryzae and Fusarium solani. The oil (1.000 µg/disk) and the extracts (1.500 µg/disk) revealed a remarkable antifungal effect against the tested plant pathogenic fungi with a radial growth in...

The actual adsorption structures of non-aromatic hydrocarbons on the MFI-type zeolites have not yet been determined. This is due to the presence of twinning, which makes crystallographic analysis difficult. We recently overcame this problem, and now report the various adsorption structures of n-butane, n-pentane, n-hexane, 1-butene, cis and trans-2-butene, 2-butyne and isopentane on silicalite-...

[1] The kinetic isotope effects (KIEs) for several ozonealkene reactions in the gas phase were studied in a 30 L PTFE reaction chamber. The time dependence of the stable carbon isotope ratios and the concentrations were determined using a gas chromatography combustion isotope ratio mass spectrometry (GCC-IRMS) system. The following average KIE values were obtained: 18.9 ± 2.8 (ethene), 9.5 ± 2....

Abstract The oxidative dehydrogenation (ODH) of 1-butene to 1,3-butadiene was studied over a series AFe 2 O 4 catalysts, where A = Zn, Mn, Ni, Cu, Mg and Fe. catalysts were characterised by XPS, EPR spectroscopy, BET surface area analysis, Raman spectroscopy XRD. All the ferrites active for ODH gave an order activity after 80 h on-stream ZnFe > NiFe MnFe MgFe CuFe FeFe . lost significant (up...

The HyChem (hybrid chemistry) approach has been proposed recently for modeling high-temperature combustion of real, multicomponent fuels. combines lumped reaction steps fuel thermal and oxidative pyrolysis with detailed chemistry oxidation the resulting products. 14 independent model parameters in are determined by matching time histories key products fuel, obtained notably from Stanford shock ...