Download PDF by A.E. Shilov, Georgiy B. Shul'pin, Alexander E. Shilov: Activation and Catalytic Reactions of Saturated Hydrocarbons

By A.E. Shilov, Georgiy B. Shul'pin, Alexander E. Shilov

ISBN-10: 0306469456

ISBN-13: 9780306469459

ISBN-10: 0792361016

ISBN-13: 9780792361015

hemistry is the technology approximately breaking and forming of bonds among atoms. essentially the most very important approaches for natural chemistry is breaking bonds C–H, in addition to C–C in a number of compounds, and basically, in hydrocarbons. between hydrocarbons, saturated hydrocarbons, alkanes (methane, ethane, propane, hexane and so on. ), are particularly appealing as substrates for chemical variations. it is because, at the one hand, alkanes are the most components of oil and common gasoline, and accordingly are the critical feedstocks for chemical undefined. however, those elements are identified to be the fewer reactive natural compounds. Saturated hydrocarbons might be known as the “noble gases of natural chemistry” and, if this is the case, the 1st consultant in their family members – methane – might be in comparison with super inert helium. As in all comparisons, this parallel among noble gases and alkanes isn't really totally actual. certainly the ameliorations of alkanes, together with methane, were recognized for a very long time. those reactions contain the interplay with molecular oxygen from air (burning – the most resource of energy!), in addition to a few mutual interconversions of saturated and unsaturated hydrocarbons. despite the fact that, some of these variations take place at increased temperatures (higher than 300–500 °C) and tend to be characterised through an absence of selectivity. The conversion of alkanes into carbon dioxide and water in the course of burning is a very worthy technique – yet no longer from a chemist viewpoint.

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Additional info for Activation and Catalytic Reactions of Saturated Hydrocarbons in the Presence of Metal Complexes

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Katal. 1974, 15, 538 (in Russian), (d) Cooper, T. ; Waters, W. A. J. Chem. Soc. B 1967, 687. ; De Radzitsky, P. J. Chem. , Perkin Trans. 2. 1972, 2247. (f) Garnett, J. ; Long M. ; Peterson, K. B. Aust. J. Chem. 1974, 27, 1823. (g) Grigoryan E. ; D’ychkovskiy, F. ; Mullagaliev, I. R. Dokl. Akad. Nauk SSSR 1975, 224, 859 (in Russian). 12. 13. ; Felkin, H. J. Chem. , Chem. Commun. 1980, 1243. (b) Crabtree, R. ; Mihelcic, J. ; Quirk, J. M. J. Am. Chem. Soc. 1979, 101, 7738. (c) Janowicz, A. ; Bergman, R.

One example was given in eq. 6). Such process can proceed with participation of ligands of metal complex. Photochemical reaction between, for example, alkane, RH, and [5], depicted by eq. 7) and initiated via mechanism of the third type can lead to the formation of an -organyl derivative of the metal and the entire process then belongs to the first type. Evidently the unambiguous assignment of a process to a particular type requires a detailed knowledge of the reaction mechanism. However, at the present time the mechanisms of many processes have not been elucidated even in a broad outline.

When irradiated with light methane (which absorbs light ) decomposes to generate the following species ( is quantum yield): Then the following stable products are formed: II. 1. C. RADIOLYSIS The interaction of high-energy irradiation with alkanes leads, at the first stage of the process, to the excitation of the hydrocarbon molecule [3a]. Furthermore, the excited molecule decomposes to generate free radicals and carbenes. Radiolysis of methane produces ethane, ethylene, and higher hydrocarbons: Transformations in the Absence of Metals 25 Pulse radiolysis of methylcyclohexane (MCH) gives rise to the formation of the solvent radical cation, but in argon-saturated MCH, the olefinic fragment cation is obtained [3b].

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Activation and Catalytic Reactions of Saturated Hydrocarbons in the Presence of Metal Complexes by A.E. Shilov, Georgiy B. Shul'pin, Alexander E. Shilov

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