Chemically induced dynamic nuclear polarization and the mechanism of the reaction of Et3Al with CCl4 in the presence of transition metal complexes |
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| Authors: | R. A. Sadykov G. D. Safina I. Kh. Teregulov E. A. Paramonov |
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| Affiliation: | 1.Institute of Petrochemistry and Catalysis,Ufa,Bashkortostan, Russia;2.Bashkir State Pedagogical University,Ufa,Bashkortostan, Russia;3.Institute of Organic Chemistry, Ufa Scientific Center,Russian Academy of Sciences,Ufa,Bashkortostan, Russia |
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| Abstract: | Integral effects of chemically induced 1H and 13C nuclear polarization are reported for the reaction of Et3Al with CCl4 catalyzed by Pd(acac)2, Cu(acac)2, and Cp2TiCl2; for the reaction of (n-C8H17)3Al with CCl4 in the absence of a catalyst and in the presence of Ni(acac)2; and for the reaction of the cyclic organoaluminum compound 1-ethyl-3-butylaluminacyclopentane with CCl4 in the presence of Pd(acac)2. A scheme of the catalytic cycle of this reaction predicting the formation of both radical and nonradical products is derived from the observed chemically induced dynamic nuclear polarization (CIDNP) effects and from data on the products of the reaction between Et3Al and CCl4 in the presence of Pd(acac)2. According to the results of qualitative analysis of the CIDNP effects, the reactions of the trialkylalanes and the cyclic organoaluminum compound with CCl4 in the presence of various metal complexes proceeded via similar mechanisms. |
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