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Xia Y, Yin D, Rong C, Xu Q, Yin D, Liu S. Impact of Lewis Acids on Diels−Alder Reaction Reactivity: A Conceptual Density Functional Theory Study. J Phys Chem A 2008; 112:9970-7. [PMID: 18785697 DOI: 10.1021/jp805410c] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yue Xia
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, P. R. China, Renaissance Computing Institute, University of North Carolina, Chapel Hill, North Carolina 27599-3455, and Division of Research Computing, Information Technology Services, University of North Carolina, 211 Manning Drive, Chapel Hill, North Carolina 27599-3420
| | - Dulin Yin
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, P. R. China, Renaissance Computing Institute, University of North Carolina, Chapel Hill, North Carolina 27599-3455, and Division of Research Computing, Information Technology Services, University of North Carolina, 211 Manning Drive, Chapel Hill, North Carolina 27599-3420
| | - Chunying Rong
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, P. R. China, Renaissance Computing Institute, University of North Carolina, Chapel Hill, North Carolina 27599-3455, and Division of Research Computing, Information Technology Services, University of North Carolina, 211 Manning Drive, Chapel Hill, North Carolina 27599-3420
| | - Qiong Xu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, P. R. China, Renaissance Computing Institute, University of North Carolina, Chapel Hill, North Carolina 27599-3455, and Division of Research Computing, Information Technology Services, University of North Carolina, 211 Manning Drive, Chapel Hill, North Carolina 27599-3420
| | - Donghong Yin
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, P. R. China, Renaissance Computing Institute, University of North Carolina, Chapel Hill, North Carolina 27599-3455, and Division of Research Computing, Information Technology Services, University of North Carolina, 211 Manning Drive, Chapel Hill, North Carolina 27599-3420
| | - Shubin Liu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, P. R. China, Renaissance Computing Institute, University of North Carolina, Chapel Hill, North Carolina 27599-3455, and Division of Research Computing, Information Technology Services, University of North Carolina, 211 Manning Drive, Chapel Hill, North Carolina 27599-3420
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Wei K, Li W, Koike K, Nikaido T. Cobalt(II)-Catalyzed Intermolecular Diels−Alder Reaction of Piperine. Org Lett 2005; 7:2833-5. [PMID: 15987148 DOI: 10.1021/ol050689i] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] An intermolecular cobalt-phosphine-catalyzed Diels-Alder reaction of piperine is described. The dimerization of piperine in the presence of cobalt-phosphine complexes gave much better yields than that in the presence of only cobalt, which, combined with the result under the purely thermal conditions, indicates that addition of phosphine ligands changes the inhibition of cobalt to the reaction into promotion. For elucidation of the distinction, different cobalt-catalyzed mechanisms were proposed for the Diels-Alder dimerization of piperine.
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Affiliation(s)
- Kun Wei
- Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba
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Fu YS, Tsai SC, Huang CH, Yen SY, Hu WP, Yu SJ. Kinetics study and theoretical modeling of the Diels-Alder reactions of cyclopentadiene and cyclohexadiene with methyl vinyl ketone. The effects of a novel organotungsten catalyst. J Org Chem 2003; 68:3068-77. [PMID: 12688774 DOI: 10.1021/jo026596l] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Diels-Alder reaction rate constants of methyl vinyl ketone with cyclopentadiene and cyclohexadiene in the presence of a novel organotungsten catalyst, [P(2-py)(3)W(CO)(NO)(2)](2+), have been measured experimentally and modeled theoretically at several temperatures. The uncatalyzed systems were also studied for direct comparison. When 0.0022 M of catalyst is present at room temperature, the rate constants were found to be approximately 5.3 and 5300 times higher than the corresponding uncatalyzed reactions for cyclopentadiene and cyclohexadiene systems, respectively. Experimental data suggested that the catalyst reduced the activation energies by 5-10 kcal/mol. However, the preexponential factors showed reduction of more than 3 orders of magnitude upon catalysis due to the entropic effects. The energy barriers and the rate constants of the uncatalyzed systems were accurately modeled by correlated electronic structure and dual-level variational transition state theory calculation. The calculated endo selectivity is in good agreement with the observed product distribution. Theoretical calculation also suggested the catalyzed reactions proceeded in a highly asynchronous or even stepwise fashion.
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Affiliation(s)
- Yaw-Shien Fu
- Department of Chemistry and Biochemistry, National Chung Cheng University, Min-Hsiung, Chia-Yi, Taiwan 621
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