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Volumn 63, Issue 12, 1998, Pages 3847-3854

Stereoselectivity of Triplet Photocycloadditions:1 Diene-Carbonyl Reactions and Solvent Effects

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Indexed keywords


EID: 0001308590     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo971767l     Document Type: Article
Times cited : (75)

References (87)
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    • (1995) Handbook of Organic Photochemistry and Photobiology , pp. 550
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    • For reviews: (a) Griesbeck, A. G. In Handbook of Organic Photochemistry and Photobiology; Horspool, W. M., Song, P.-S., Eds.; CRC Press: Boca Raton, 1995; p 550; (b) p 755. (c) Porco, J. A.; Schreiber, S. L. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Plenum Press: New York, 1991; Vol. 5, p 151. (d) Carless, H. A. J. In Synthetic Organic Photochemistry; Horspool, W. M., Ed.; Plenum Press: New York, 1984; p 425. (e) Jones, G., II. In Padwa, A., Ed. Org. Photochem. 1981, 5, 1.
    • Handbook of Organic Photochemistry and Photobiology , pp. 755
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    • Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Plenum Press: New York
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    • (1991) Comprehensive Organic Synthesis , vol.5 , pp. 151
    • Porco, J.A.1    Schreiber, S.L.2
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    • Horspool, W. M., Ed.; Plenum Press: New York
    • For reviews: (a) Griesbeck, A. G. In Handbook of Organic Photochemistry and Photobiology; Horspool, W. M., Song, P.-S., Eds.; CRC Press: Boca Raton, 1995; p 550; (b) p 755. (c) Porco, J. A.; Schreiber, S. L. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Paquette, L. A., Eds.; Plenum Press: New York, 1991; Vol. 5, p 151. (d) Carless, H. A. J. In Synthetic Organic Photochemistry; Horspool, W. M., Ed.; Plenum Press: New York, 1984; p 425. (e) Jones, G., II. In Padwa, A., Ed. Org. Photochem. 1981, 5, 1.
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    • In Padwa, A., Ed.
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    • note
    • The exo diastereoisomer of 5 was independently synthesized from 2 by catalytic reduction with Pd-C in EtOAc, following a procedure reported in ref 11n.
  • 67
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    • This effect was also reported for other "non-ideal" solvent mixtures (e.g., n-hexane/propionitrile): Suppan, P. J. Chem. Soc., Faraday Trans. 1 1987, 83, 495.
    • (1987) J. Chem. Soc., Faraday Trans. 1 , vol.83 , pp. 495
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    • note
    • For the propionic aldehyde photocycloaddition to furan an exo/ endo ratio of 82:1 was determined: Fiege, M. University of Cologne, unpublished results.
  • 70
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    • note
    • -3; program used, Siemens SHELXTL-93.
  • 79
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    • note
    • -3; program used, Siemens SHELXTL-93.
  • 84
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    • note
    • One reviewer remarked that the endo/exo ratios (described, for example, in eq 3) do not vary in the same order as A values, which are often used to quantify the steric demand of a specific group. This is definitely true, and other contributions also have to be considered, e.g., spin dilution effects by the (conjugated or notconjugated) substituent. For cyclic monoalkenes, we have shown that steric effects are truly decisive (ref 7b-e), and A values are useful parameters to correlate with stereoselectivities. In our opinion, A values are, however, not applicable for description of steric interactions in biradicals such as F′. The cyano group (A value ca. 1.0) is expected to interact much stronger in the pseudoperpendicular conformation F′ than does a methyl group (A value 7.5).


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