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Quantum Chemical Mo...
Quantum Chemical Modeling of Propene and Butene Epoxidation with Hydrogen Peroxide
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- Lundin, Angelica, 1971 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry,University of Gothenburg
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- Panas, Itai, 1959 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ahlberg, Elisabet, 1952 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry,University of Gothenburg
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(creator_code:org_t)
- 2008-12-11
- 2008
- English.
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In: Journal of Physical Chemistry A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 113:1, s. 282-290
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Abstract
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- The mechanism of hydrogen peroxide assisted epoxidation of propene, 1-butene, trans-2-butene, cis-2-butene, and isobutene was studied using density functional theory calculations. The results are rationalized in the context of the previously proposed direct pathway for epoxidation of ethene with hydrogen peroxide and compared to the indirect pathway involving Ti(IV) peroxide groups. The indirect Ti(IV) peroxide pathway displays a 57.8 kJ mol-1 activation enthalpy for the rate limiting step [Phys. Chem. Chem. Phys. 2007, 9, 5997]. In contrast, a lowering of the activation enthalpy is observed for the direct mechanism according to 72.3 (ethene), 53.9 (1-butene), 53.5 (propene), 46.9 (trans-2-butene), 46.6 (isobutene), and 42.6 (cis-2-butene) kJ mol-1 when the reaction takes place on a binuclear Ti(IV) dihydroxide site. These values clearly show that the direct pathway becomes the most favorable. The stability of the epoxides toward hydrolysis to the corresponding diols are also addressed. The present work clearly demonstrates the generality and efficiency of a binuclear dihydroxide site in catalyzing the epoxidation of olefins with hydrogen peroxide, thus avoiding the formation of a surface peroxide group.
Subject headings
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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