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Ochando-Pardo M, Nebot-Gil I, González-Lafont A, Lluch JM. Methyl Vinyl Ketone+OH and Methacrolein+OH Oxidation Reactions: A Master Equation Analysis of the Pressure- and Temperature-Dependent Rate Constants. Chemistry 2007; 13:1180-90. [PMID: 17066494 DOI: 10.1002/chem.200600529] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
High-level electronic structure calculations and master equation analyses were carried out to obtain the pressure- and temperature-dependent rate constants of the methyl vinyl ketone+OH and methacrolein+OH reactions. The balance between the OH addition reactions at the high-pressure limit, the OH addition reactions in the fall-off region, and the pressure-independent hydrogen abstractions involved in these multiwell and multichannel systems, has been shown to be crucial to understand the pressure and temperature dependence of each global reaction. In particular, the fall-off region of the OH addition reactions contributes to the inverse temperature dependence of the rate constants in the Arrhenius plots, leading to pressure-dependent negative activation energies. The pressure dependence of the methyl vinyl ketone+OH reaction is clearly more important than in the case of the methacrolein+OH reaction owing to the weight of the hydrogen abstraction process in this second system. Comparison of the theoretical rate constants and the experimental measurements shows quite good agreement.
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Barba C, Carmona D, García JI, Lamata MP, Mayoral JA, Salvatella L, Viguri F. Conformational Preferences of Methacrolein in Diels−Alder and 1,3-Dipolar Cycloaddition Reactions. J Org Chem 2006; 71:9831-40. [PMID: 17168603 DOI: 10.1021/jo062200k] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A B3LYP/6-31G* study has been carried out for the reactions of methacrolein with cyclopentadiene, parent nitrone, 1-pyrroline-1-oxide, and (Z)-C,N-diphenylnitrone, in which the coordination of a Lewis acid (borane) and the solvent polarity (dichloromethane) have been taken into account. Calculated activation parameters, regioselectivities (for 1,3-dipolar cycloaddition reactions), and endo/exo stereoselectivities show good agreement with available experimental data. Gas-phase calculations show a varied behavior of the s-cis/s-trans TS stability for noncatalyzed reactions (from the systematic s-cis preference for the cyclopentadiene reaction to the systematic s-trans predilection encountered in the diphenylnitrone cycloaddition). BH3 coordination leads to a preferential stabilization of s-trans TSs in the reactions of cyclopentadiene (exo approach) and diphenylnitrone but a larger stabilization of s-cis structures in the processes involving the parent nitrone or 1-pyrroline-1-oxide. Additionally, a rather systematic preferential stabilization of s-trans structures is induced by solvent polarity in most reactions. As a consequence, an s-trans preference is predicted in solution for both thermal and catalyzed types of reactions in most approaches. Such a conclusion is consistent with some experimental results suggesting a preference for a particular conformation of the methacrolein-Lewis acid complexes.
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Affiliation(s)
- Carmen Barba
- Departamento de Química InorgAnica, Instituto de Ciencia de Materiales de Aragón, Instituto Universitario de CatAlisis Homogénea, Facultad de Ciencias, Universidad de Zaragoza-CSIC, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
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Ochando-Pardo M, Nebot-Gil I, González-Lafont A, Lluch JM. Pressure dependence in the methyl vinyl ketone + OH and methacrolein + OH oxidation reactions: an electronic structure study. Chemphyschem 2005; 6:1567-73. [PMID: 16025561 DOI: 10.1002/cphc.200500115] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
High-level electronic structure calculations were carried out for the study of the reaction pathways in the OH-initiated oxidations of methyl vinyl ketone (MVK) and methacrolein (MACR). For the two conformers of MVK (called synperiplanar and antiperiplanar), the addition channels of OH to the terminal and central carbon atom of the double bond dominate the overall rate constant, whereas the abstraction of the methyl hydrogen atoms has no significant kinetic role. In the case of MACR, only the antiperiplanar conformer is important in its reactivity. In addition, the lower Gibbs free energy barrier for MACR corresponds to the aldehydic hydrogen abstraction reaction, which will be somewhat more favorable than the addition processes. The subtle balance between the different pathways (additions versus abstractions) serves to give an understanding of the pressure dependence of the rate constants of these tropospheric oxidation processes.
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Affiliation(s)
- Montserrat Ochando-Pardo
- Departament de Química Física and Institut de Ciència Molecular, Universitat de València, 46100 Burjassot, Spain
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Ochando-Pardo M, Nebot-Gil I, González-Lafont À, Lluch JM. Enthalpies of formation of isoprene’s major oxidation byproducts. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.04.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hopf H, Mlynek C, Klein D, Traetteberg M, Bakken P. The Molecular Structure of 3-tert-Butyl-4,4-dimethyl-2-pentenal (3,3-Di-tert-butylpropenal). European J Org Chem 2001. [DOI: 10.1002/1099-0690(200104)2001:7<1385::aid-ejoc1385>3.0.co;2-p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Shishkov IF, Shlykov S, Rousseau B, Peng ZH, Van Alsenoy C, Geise HJ, Kataeva ON, Herrebout WA, Van der Veken B. Gas-Phase Conformations of 3-Buten-2-ol from Density-Functional Theoretical Results Together with Electron-Diffraction and Vibrational Spectroscopic Data. J Phys Chem A 2001. [DOI: 10.1021/jp002616g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | | | - O. N. Kataeva
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Russian Academy of Sciences, A.E. Arbuzov street 8, Kazan 420083, Russia
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Sakaizumi T, Imajo H, Yamasaki R, Usami T, Kawaji S, Abe S, Haraga T, Morii H, Kuze N, Ohashi O. Generation, Microwave Spectrum, Barrier to Internal Rotation of Methyl Group, and ab Initio MO Calculation of syn-2-Nitrosopropene, syn-CH(2)&dbond;C(CH(3))&bond;N&dbond;O. JOURNAL OF MOLECULAR SPECTROSCOPY 2000; 204:26-35. [PMID: 11034839 DOI: 10.1006/jmsp.2000.8183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
syn-2-Nitrosopropene was generated, in the gas phase, by chemical reaction of 1-chloro-2-(hydroxyimino)propane with K(2)CO(3) and identified by microwave spectroscopy. The microwave spectrum of the reaction product was observed in the frequency range from 8.0 to 40.0 GHz. The rotational constants (MHz) were determined as A = 8744.09(6), B = 4846.07(2), and C = 3177.84(3) for CH(2)&dbond;C(CH(3))&bond;(14)NO (normal species) and A = 8664.36(5), B = 4822.15(3), and C = 3157.04(3) for CH(2)&dbond;C(CH(3))&bond;(15)NO ((15)N species) in the ground vibrational state. The values of the planar moment (P(cc) = (I(a) + I(b) - I(c))/2) obtained for the normal and (15)N species were 1.525(1) and 1.526(1) u Å(2), respectively. This suggests that the nitrogen atom lies in or is close to the ab inertial plane of the molecule and shows also that only two hydrogen atoms are located symmetrically out of the symmetry plane. The reaction product was determined to be syn-2-nitrosopropene by comparing the observed and calculated rotational constants, kappa (Ray's asymmetry parameter) and r(s) coordinates of the nitrogen atom. The dipole moments (D) were determined to be µ(a) = 2.43(5), µ(b) = 1.12(7), and µ(total) = 2.67(7). The barrier heights of the internal rotation owing to the methyl group of the normal species in the ground and first excited torsional states were determined to be 1750(50) and 1740(50) cal/mol (1 cal/mol = 4.184 J/mol), respectively. The (14)N nuclear quadrupole coupling constants (MHz) were determined to be chi(aa) = 0.25(21), chi(bb) = -7.11(40), and chi(cc) = 6.85(61). Two vibrational excited states were observed and the vibrational frequencies (cm(-1)) of the C-N and C-C torsional modes were determined to be 160(40) and 175(40), respectively. The lifetime of syn-2-nitrosopropene was found to be ca. 2 min in the waveguide cell. Copyright 2000 Academic Press.
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Affiliation(s)
- T Sakaizumi
- Department of Chemistry, Faculty of Science and Technology, Sophia University, 7-1, Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
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The SPASIBA force field of aldehydes. Part II: structure and vibrational wavenumbers of ethandial, propenal and 2-methylpropenal. J Mol Struct 1999. [DOI: 10.1016/s0022-2860(98)00552-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Wang Y, Tremmel J, De Smedt J, Van Alsenoy C, Geise HJ, Van der Veken B. Ab Initio Determination of the Force Field of Dichloromethane, Verified by Gas-Phase Infrared Frequencies and Intensities and Applied to a Combined Electron Diffraction and Microwave Investigation of Geometry. J Phys Chem A 1997. [DOI: 10.1021/jp9707192] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Wang
- University of Antwerp (UIA), Department of Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - J. Tremmel
- University of Antwerp (UIA), Department of Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - J. De Smedt
- University of Antwerp (UIA), Department of Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - C. Van Alsenoy
- University of Antwerp (UIA), Department of Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - H. J. Geise
- University of Antwerp (UIA), Department of Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - B. Van der Veken
- University of Antwerp (RUCA), Department of Inorganic Chemistry, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
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García J, Mayoral J, Salvatella L, Assfeld X, Ruiz-López MF. On the conformational preferences of α,β-unsaturated carbonyl compounds. An ab initio study. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0166-1280(95)04391-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Bao J, Wulff WD. A comparison of Diels-Alder catalysts generated from linear and vaulted biaryls and bromoborane-dimethylsulfide complex. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00534-j] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Naumov V, Tuzova L, De Smedt J, Van Alsenoy C, Geise H. Chloromethyl phenyl ether in the gas phase, studied by electron diffraction, infrared spectroscopy and ab initio calculations. J Mol Struct 1995. [DOI: 10.1016/0022-2860(94)08414-d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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