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Volumn 118, Issue 26, 1996, Pages 6220-6224

Structures and reactivities of ethylene dication electrophiles

Author keywords

[No Author keywords available]

Indexed keywords

KETONE; OXIME DERIVATIVE;

EID: 0030057255     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja953623z     Document Type: Article
Times cited : (23)

References (41)
  • 1
    • 84947153143 scopus 로고
    • Observation: Benoit, C.; Horsley, J. A. Mol. Phys. 1975, 30, 557. Theoretical calculations: Lammertsma, K.; Barzaghi, M.; Olah, G. A.; Pople, J. A.; Kos, A. J., Schleyer, P. v. R. J. Am. Chem. Soc. 1983, 105, 5252.
    • (1975) Mol. Phys. , vol.30 , pp. 557
    • Benoit, C.1    Horsley, J.A.2
  • 12
    • 0012671073 scopus 로고
    • Olah, G. A.; Calin, M. J. Am. Chem. Soc. 1968, 90, 4672-4675. Olah, G. A.; Grant, J. L.; Westerman, P. W. J. Org. Chem. 1975, 40, 2102-2108.
    • (1968) J. Am. Chem. Soc. , vol.90 , pp. 4672-4675
    • Olah, G.A.1    Calin, M.2
  • 14
    • 0026010517 scopus 로고
    • 0) of the trifluoromethanesulfonic acid (TFSA)-trifluoroacetic acid (TFA) system has been described: Saito, S.; Saito, S.; Ohwada, T.; Shudo, K. Chem. Pharm. Bull. 1991, 39, 2718-2720. See also: Saito, S.; Sato, Y.; Ohwada, T.; Shudo, K. J. Am. Chem. Soc. 1994, 116, 2312-2317, footnote 8.
    • (1991) Chem. Pharm. Bull. , vol.39 , pp. 2718-2720
    • Saito, S.1    Saito, S.2    Ohwada, T.3    Shudo, K.4
  • 15
    • 0000528149 scopus 로고
    • footnote 8
    • 0) of the trifluoromethanesulfonic acid (TFSA)-trifluoroacetic acid (TFA) system has been described: Saito, S.; Saito, S.; Ohwada, T.; Shudo, K. Chem. Pharm. Bull. 1991, 39, 2718-2720. See also: Saito, S.; Sato, Y.; Ohwada, T.; Shudo, K. J. Am. Chem. Soc. 1994, 116, 2312-2317, footnote 8.
    • (1994) J. Am. Chem. Soc. , vol.116 , pp. 2312-2317
    • Saito, S.1    Sato, Y.2    Ohwada, T.3    Shudo, K.4
  • 19
    • 8944244899 scopus 로고    scopus 로고
    • note
    • The possible solubility increase of benzene in the case of the higher acidity seems to affect the rate of reactions. However, the increase of benzene may be caused by the production of benzenium ions which may not be a substrate for the electrophile. Even if this was the case, the very slow reaction in the medium which is acidic enough to monoprotonate the substrate completely definitely eliminates the possibility of the participation of the monoprotonated species.
  • 20
    • 8944247174 scopus 로고    scopus 로고
    • note
    • Though some difference in solvent effect may exist, the presence of the same diprotonated species in TFSA is in accordance with the normal acid-base equilibrium.
  • 22
    • 8944219692 scopus 로고    scopus 로고
    • note
    • Probable pinacol intermediates will not give the ketol products in a strong acid. The pinacol ionizes to the ethylene dications in TFSA and gives another product: 1,1,2,2-tetraphenylethanediol gave 9,10-diphenylphenanthrene in TFSA through a tetraphenylethylene dication intermediate (see ref 3a,c). In the reactions of dicarbonyl compounds, such cyclized products cannot be detected.
  • 23
    • 84982207554 scopus 로고
    • + values of acetone, acetophenone, acetic acid (in place of methyl acetate), and acetone oxime are -7.2, -6.17, -6.10, and -1.9, respectively (Arnett, E. M. Prog. Phys. Org. Chem. 1963, 1, 223-403). Thus, the cation centers of protonated species are stabilized in this order.
    • (1963) Prog. Phys. Org. Chem. , vol.1 , pp. 223-403
    • Arnett, E.M.1
  • 24
    • 8944256773 scopus 로고    scopus 로고
    • note
    • 2,3-Butanedione monoxime was a single isomer with respect to the oxime group, as judged from the NMR data.
  • 27
    • 8944258829 scopus 로고    scopus 로고
    • note
    • 5 suggested a predominant hydroxyiminium resonance structure, which is consistent with the observed reactivity as an electrophile (see ref 15).
  • 37
    • 0000140223 scopus 로고
    • Suzuki, T.; Shiohara, H.; Monobe, M.; Sakimura, T.; Tanaka, S.; Yamashita, Y.; Miyashi, T. Angew. Chem., Int. Ed. Engl. 1992, 31, 455-458. Malandra, J. L.; Mills, N. S.; Kadlecek, D. E.; Lowery, J. A. J. Am. Chem. Soc. 1994, 116, 11622-11623.
    • (1994) J. Am. Chem. Soc. , vol.116 , pp. 11622-11623
    • Malandra, J.L.1    Mills, N.S.2    Kadlecek, D.E.3    Lowery, J.A.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.