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0344126387
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For the structure of a Ti(IV)/Pd(II)-based complex, see: (d) Hess, A.; Lefeber, C.; Spannenberg, A.; Kempe, R.; Baumann, W.; Holz, J.; Börner, A. Tetrahedron 1996, 52, 14599.
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0001479313
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BSA/AcOK cat. is a standard enolizing system in palladium-catalyzed allylic alkylations. Trost, B. M.; Murphy, D. J. Organometallics 1985, 4, 1143.
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0000099879
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Scheffold, R., Ed. Salle + Sauerlander: Aarau, As expected, copious or total transesterification products can be detected with highly prolonged reaction times
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Seebach, D.; Weidmann, B.; Widler, L. In Modern Synthetic Methods; Scheffold, R., Ed. Salle + Sauerlander: Aarau, 1983; pp 217-351. As expected, copious or total transesterification products can be detected with highly prolonged reaction times.
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0344557878
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J. D., Ed.; Academic Press: New York, Chapter. 8
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30
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0345420026
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note
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4 is a rapid process on the NMR time scale at room temperature, involving the fluxional exchange between bound and unbound carbonyl esters. See ref 12.
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31
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0344988869
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note
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4-mediated monotransesterification was the only detectable reaction.
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32
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84945959007
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4, see: Sasai, H.; Suzuki, T.; Arai, S.; Arai, T.; Shibasaki, M. J. Am. Chem. Soc. 1992, 114, 4418.
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Shibasaki, M.5
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33
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0344988865
-
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note
-
This result suggests that the mechanism leading to the titanium enolates postulated by Taguchi in the iodocarbocyclization process might need a slight revision, i.e., the requirement of an external deprotonating agent, such as the iodide anion released in the iodionium ion formation, or an added base.
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34
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84990168561
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At present we do not have structural information on these transiently generated titanated species. In particular, study of the titanated derivative of the disulfone (1c), for which a true enolate form is forbidden, might prove of structural interest. For studies on the structure of α-lithiated sulfones, see: (a) Gais, H.-J.; Hellmantn, G.; Günther, H.; Lopez, F.; Lindner, H. J.; Braun, S. Angew. Chem., Int. Ed. Engl. 1989, 28, 1025.
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Lindner, H.J.5
Braun, S.6
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(b) Hollstein, W.; Harms, K.; Marsch, M.; Boche, G. Angew. Chem., Int. Ed. Engl. 1988, 27, 846.
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Hollstein, W.1
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38
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15844412400
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(b) Murahashi, S.-I.; Naota, T.; Taki, H.; Mizuno, M.; Takaya, H.; Komiya, S.; Mizuho, I.; Oyasato, N.; Hiraoka, M.; Hirano, M.; Fukuoka, A. J. Am. Chem. Soc. 1995, 117, 12436.
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Murahashi, S.-I.1
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Mizuno, M.4
Takaya, H.5
Komiya, S.6
Mizuho, I.7
Oyasato, N.8
Hiraoka, M.9
Hirano, M.10
Fukuoka, A.11
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