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Volumn 118, Issue 11, 1996, Pages 2625-2633

Hammett studies on alkene extrusion from rhenium(V)diolates and an MO description of metal alkoxide-alkyl metal oxo interconversion

Author keywords

[No Author keywords available]

Indexed keywords

ALKENE DERIVATIVE; RHENIUM COMPLEX;

EID: 0029960794     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja952537w     Document Type: Article
Times cited : (65)

References (72)
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    • See Tables 3-6 in Experimental Section
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    • note
    • xReO; mixtures (refs 2a. 32). If the first step in diolate cycloreversion were highly exothermic (ΔH° < -5 kcal/ mol) we would be able to detect the intermediate in the reverse reaction for oxidation of highly strained alkenes. Actually. this reveals that the reaction is not exoergic. however. for a unimolecular rearrangement. ΔS° ≈ 0 and so extrapolation to saying that ΔH° ≥ -5 kcal/mol for the first step is justified. We thank a referee tor pointing out the distinction.
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    • Although the two Hammett experiments were performed 10 °C apart, the low ΔS°-V observed (see Table 2) und the relatively small temperature difference allow comparison of the two.
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    • note
    • It is, however, important to note the differences between this system and organic processes as has been done above The absence of charge means that electronic effects will be dictated by changes in electronegativity Thus, migration of carbon from (electronegative) oxgen to (electropositive) rhenium will result in the positive ρ seen here rather than the negative value seen in the organic processes cited.
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    • No symmetry restrictions were placed on the calculations so the two highest HOMOs were not degenerate as expected from C, symmetry. However, the (HOMO-1) orbital was quite close in energy and quite similar in nature.
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    • This is a well-documented process, particularly for early metal oxo compounds. See: (a) deWith, J.; Horton, A. D.; Orpen, A. G. Organometallics 1993, 12, 1493-1496. (b) Klein, D. P.; Hayes, J. C.; Bergman, R. G. J Am. Chem. Soc. 1988, 110, 3704-3706. (c) Klein, D. P.; Bergman, R. G. J. Am. Chem. Soc. 1989, 111, 3079-3080. (d) Hartwig, J. F ; Bergman, R. G.; Anderson, R. A. J. Am. Chem. Soc. 1990, 112, 3234-3236. (e) Carney, M. J.; Walsh, P. J.; Hollander, F. J., Bergman, R G. J. Am. Chem. Soc. 1990, 112, 6426-6428. (f) Vaughan, G. A.; Sofield, C D., Hillhouse, G. L.; Rheingold, A. L. J Am. Chem. Soc. 1989, 111, 5491-5493. (g) Walsh, P. J.; Baranger, A. M., Bergman, R. G. J. Am Chem. Soc 1992, 114, 1708-1719. (h) Baranger, A. M.; Walsh, P. J.; Bergman, R. G. J. Am Chem. Soc. 1993, 115, 2753-2763.
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    • See also refs 23 and 24
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    • Several examples: (a) Herrmann, W. A , Eder, S. J.; Scherer, W. J Organomet. Chem. 1993, 454, 257-261 (b). Herrmann, W. A , Serrano, R.; Küsthardt, U.; Ziesler, M. L ; Guggolz, E.; Zahn, T. Angew. Chem., Int Ed. Engl. 1984, 23, 515-517. (c) Legzdins, P., Rettig, S. J , Sanchez, L. Organometallics 1985, 4, 1470-1471. (d) Schrauzer, G. N., Hughes, L. A.; Strampach, N.; Ross, F.; Ross, D.; Schlemper, E. O. Organometallics 1983, 2, 481-485.
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    • Herrmann, W.A.1    Eder, S.J.2    Scherer, W.3
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    • Several examples: (a) Herrmann, W. A , Eder, S. J.; Scherer, W. J Organomet. Chem. 1993, 454, 257-261 (b). Herrmann, W. A , Serrano, R.; Küsthardt, U.; Ziesler, M. L ; Guggolz, E.; Zahn, T. Angew. Chem., Int Ed. Engl. 1984, 23, 515-517. (c) Legzdins, P., Rettig, S. J , Sanchez, L. Organometallics 1985, 4, 1470-1471. (d) Schrauzer, G. N., Hughes, L. A.; Strampach, N.; Ross, F.; Ross, D.; Schlemper, E. O. Organometallics 1983, 2, 481-485.
    • (1984) Angew. Chem., Int Ed. Engl. , vol.23 , pp. 515-517
    • Herrmann, W.A.1    Serrano, R.2    Küsthardt, U.3    Ziesler, M.L.4    Guggolz, E.5    Zahn, T.6
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    • Several examples: (a) Herrmann, W. A , Eder, S. J.; Scherer, W. J Organomet. Chem. 1993, 454, 257-261 (b). Herrmann, W. A , Serrano, R.; Küsthardt, U.; Ziesler, M. L ; Guggolz, E.; Zahn, T. Angew. Chem., Int Ed. Engl. 1984, 23, 515-517. (c) Legzdins, P., Rettig, S. J , Sanchez, L. Organometallics 1985, 4, 1470-1471. (d) Schrauzer, G. N., Hughes, L. A.; Strampach, N.; Ross, F.; Ross, D.; Schlemper, E. O. Organometallics 1983, 2, 481-485.
    • (1985) Organometallics , vol.4 , pp. 1470-1471
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    • Several examples: (a) Herrmann, W. A , Eder, S. J.; Scherer, W. J Organomet. Chem. 1993, 454, 257-261 (b). Herrmann, W. A , Serrano, R.; Küsthardt, U.; Ziesler, M. L ; Guggolz, E.; Zahn, T. Angew. Chem., Int Ed. Engl. 1984, 23, 515-517. (c) Legzdins, P., Rettig, S. J , Sanchez, L. Organometallics 1985, 4, 1470-1471. (d) Schrauzer, G. N., Hughes, L. A.; Strampach, N.; Ross, F.; Ross, D.; Schlemper, E. O. Organometallics 1983, 2, 481-485.
    • (1983) Organometallics , vol.2 , pp. 481-485
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