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Often, α-substituents have been employed to prevent equilibration. For the use of arylhetero α-substituents as substrate auxiliaries, see: (a) Fang, J.-M. J. Org. Chem. 1982, 47, 3464.
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33845183574
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also see ref 7b
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For monoalkylation of the lithium enolate of cyclopentanone in THF-HMPA solution using additives, see: Monta, Y.; Suzuki, M.; Noyori, R. J. Org. Chem. 1989, 54, 1785, also see ref 7b.
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0000040309
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Except these cases where tris(dialkylamino)sulfonium difluorotrimethylsilicate (TASF) was used as the fluoride source, see: (a) Noyori, R.; Nishida, I.; Sakata, J. Tetrahedron Lett. 1980, 21, 2085.
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(b) Pilcher, A. S.; DeShong, P. J. Org. Chem. 1996, 61, 6901. For a revised synthetic procedure of analytically pure TBAT, see:
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0042790189
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note
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(d) Commercial TBAT was treated with anhydrous benzene and dried under vacuum in order to remove possible water contamination (see Supporting Information).
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-
-
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30
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0041788006
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note
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5b
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31
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Nishida, A.; Kawahara, N.; Nishida, M.; Yonemitsu, O. Tetrahedron 1996, 52, 9713.
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Wong, C.F.3
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