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Volumn 119, Issue 51, 1997, Pages 12492-12502

Preassociation, free-ion, and ion-pair pathways in the electrophilic bromination of substituted cis- and trans-stilbenes in protic solvents

Author keywords

[No Author keywords available]

Indexed keywords

STILBENE DERIVATIVE;

EID: 0031585686     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9700461     Document Type: Article
Times cited : (43)

References (98)
  • 51
    • 0003845262 scopus 로고
    • Harris, J. M., McManus, S. P., Eds; American Chemical Society: Washington, DC
    • (b) Bentley; T. W. In Nucleophilicity; Harris, J. M., McManus, S. P., Eds; American Chemical Society: Washington, DC, 1987; pp 255-268.
    • (1987) Nucleophilicity , pp. 255-268
    • Bentley, T.W.1
  • 54
    • 85083149830 scopus 로고    scopus 로고
    • note
    • The terms "erythro" and "threo" are not strictly applicable to these diastereoisomers. They are used here as a convenient way of describing the stereochemistry of dibromide and mixed adduct formation.
  • 56
    • 85083134523 scopus 로고    scopus 로고
    • note
    • (a) Attempts to brominate p,p′-dimethoxystilbenes in methanol yielded 1,2-dimethoxy-1,2-di(p-methoxyphenyl)ethane arising from the solvolysis of the first formed methoxybromo adduct.
  • 63
    • 3743120629 scopus 로고
    • (b) Ruasse, M. F.; Dubois, J. E. J. Org. Chem. 1973, 38, 473; 1974, 39, 2441.
    • (1974) J. Org. Chem. , vol.39 , pp. 2441
  • 64
    • 85083131369 scopus 로고    scopus 로고
    • note
    • 28 see footnote 14 in ref 27a.
  • 78
    • 1542377175 scopus 로고
    • Golding, B. T., Griffin, R. J., Maskill, H., Eds; The Royal Society of Chemistry: Cambridge
    • (e) McClelland, R. A. In Organic Reactivity: Physical and Biological Aspects; Golding, B. T., Griffin, R. J., Maskill, H., Eds; The Royal Society of Chemistry: Cambridge, 1995; p 301.
    • (1995) Organic Reactivity: Physical and Biological Aspects , pp. 301
    • McClelland, R.A.1
  • 80
    • 85083144986 scopus 로고    scopus 로고
    • note
    • - capture of free ions 5 is excluded because of the very low concentration of bromide ions resulting from the dissociation of the ion pair.
  • 81
    • 85083150138 scopus 로고    scopus 로고
    • note
    • It should be noted also that dibromide is obtained with a stereoselectivity better than that of MA, showing that the lifetime of the free ion is longer than that of the ion pair.
  • 84
    • 85083126461 scopus 로고    scopus 로고
    • note
    • -1 range, according to preliminary measurements of lifetimes of stilbene bromination intermediates (Chiappe, C.; Lo Moro, G.; Ruasse, M. F, unpublished results).
  • 86
    • 85083149159 scopus 로고    scopus 로고
    • note
    • +-MeOH reaction. This primary effect would superimpose to the KSIE on the ionization step resulting in the observed increase in the experimental value.


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