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Hanamura M, Kamada J, Amano A, Takeuchi K, Okazaki T, Hirai K, Kitagawa T. Self-Sensitized Photooxygenation of a C60-Cycloheptatriene Dyad to Form Norcaradiene-Derived Endoperoxides. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901453] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kitagawa T, Kamada J, Minegishi S, Takeuchi K. Acid-catalyzed rearrangement of ethynylcycloheptatriene to phenylallene. Org Lett 2000; 2:3011-3. [PMID: 10986095 DOI: 10.1021/ol006328e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
7-Ethynylcycloheptatriene (1) cleanly isomerizes to phenylallene in the presence of acid. A mechanism involving the protonation of ethynylnorcaradiene, which is in equilibrium with 1, followed by the cleavage of a three-membered ring to give an arenium ion, is proposed. The rearrangement is accelerated by a factor of 370 by introducing tert-butyl groups on C-2 and C-5, indicating the importance of the equilibrium concentration of the norcaradiene form as a rate-controlling factor.
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Affiliation(s)
- T Kitagawa
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
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Gridnev ID, Tok OL, Gridneva NA, Bubnov YN, Schreiner PR. Synthesis and Dynamic Properties of Cycloheptatrienyl(dipropyl)borane. Equilibrium with 7-Dipropylborylnorcaradiene. J Am Chem Soc 1998. [DOI: 10.1021/ja9724699] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ilya D. Gridnev
- Contribution from the A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova 28, 117813 Moscow, Russia, and Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
| | - Oleg L. Tok
- Contribution from the A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova 28, 117813 Moscow, Russia, and Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
| | - Natalya A. Gridneva
- Contribution from the A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova 28, 117813 Moscow, Russia, and Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
| | - Yuri N. Bubnov
- Contribution from the A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova 28, 117813 Moscow, Russia, and Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
| | - Peter R. Schreiner
- Contribution from the A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova 28, 117813 Moscow, Russia, and Institut für Organische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
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Kitagawa T, Tanaka T, Takata Y, Takeuchi K, Komatsu K. Ionically Dissociative hydrocarbons Containing the C 60 Skeleton [1] † †This work is respectfully dedicated to Prof. William von E. Doering on the occasion of his 80th birthday. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00339-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Moorhoff CM. An unusual condensation of alkyl 3-oxo-4-(triphenylarsoranylidene)butanoate with aldehydes; synthesis of symmetrical substituted 1,3,5-cycloheptatrienes. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)00809-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Kitagawa T, Miyabo A, Fujii H, Okazaki T, Mori T, Matsudou M, Sugie T, Takeuchi K. Self-Initiated Autoxidation of a Sterically Crowded Cycloheptatriene Derivative via Norcaradienyloxyl Radicals. J Org Chem 1997. [DOI: 10.1021/jo961321p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Toshikazu Kitagawa
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Atsushi Miyabo
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Hideki Fujii
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Takao Okazaki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Tetsuya Mori
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Masaki Matsudou
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Takeshi Sugie
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
| | - Ken'ichi Takeuchi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
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Matsumoto M, Shiono T, Kasuga NC. 7-alkyl-7-hydroxymethyl-3,4-dimethoxynorcaradienes: A new type of norcaradiene stabilized by π-donors. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)01882-i] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Saba A. 7-methyl-tricyclo[5.3.0.0.1,6]Deca-2,4-dien-8-ones: The first examples of tricyclonorcaradienones in tautomeric equilibrium with the 7-methyl-bicyclo[5.3.0]1,3,5-decatrien-8-ones. Tetrahedron Lett 1990. [DOI: 10.1016/s0040-4039(00)97700-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Daub J, Lüdemann HD, Michna M, Strobl RM. Über das korrespondierende Verhalten von heteroatom-stabilisierten Carbokationen und dem Cycloheptatrien-Norcaradien-Gleichgewicht. ACTA ACUST UNITED AC 1985. [DOI: 10.1002/cber.19851180221] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Takeuchi K, Kitagawa T, Senzaki Y, Okamoto K. DISTINCT OBSERVATION OF TWO CONFORMERS OF 7-CYANOCYCLOHEPTATRIENES CONTAINING At-BUTYL GROUP AT 2- OR 3-POSITION: AN APPROACH TO VALID INTERPRETATION OF NMR SPECTRA OF CYCLOHEPTATRIENE DERIVATIVES. CHEM LETT 1983. [DOI: 10.1246/cl.1983.73] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Takeuchi K, Kitagawa T, Senzaki Y, Fujimoto H, Okamoto K. 2,5-DI-t-BUTYL-7-CYANONORCARADIENE IN EQUILIBRIUM WITH THE CYCLOHEPTATRIENE FORM: THE FIRST OBSERVATION OFexoANDendoORIENTATION OF THE 7-CYANO SUBSTITUENT IN THE NORCARADIENE FORM. CHEM LETT 1983. [DOI: 10.1246/cl.1983.69] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Adam W, Rebollo H. Singlet oxygenation of 7-aryl and 7-alkyl-1,3,5-cycloheptatrienes: substituent effects on the product distribution of tropilidene- and nocaradiene-derived endoperoxides. Tetrahedron Lett 1982. [DOI: 10.1016/s0040-4039(00)85744-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Takeuchi K, Fujimoto H, Okamoto K. Primary dependence of 7-aryl-2,5-di-t-butyl-1,3,5-cycloheptatriene valence tautomerism on the π-acceptor strength of the 7-aryl substituent. Tetrahedron Lett 1981. [DOI: 10.1016/s0040-4039(01)92397-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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