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8
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0032547286
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(7) Kobayashi, S.; Nagayama, S.; Busujima, T. J. Am. Chem. Soc. 1998, 120, 8287.
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9
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0030913328
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(8) Kobayashi, S.; Wakabayashi, T.; Nagayama, S.; Oyamada, H. Tetrahedron Lett. 1997, 38, 4559.
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12
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-
0013555602
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-
note
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4, concentrated, and purified by silica gel chromatography.
-
-
-
-
13
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0001131962
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(11) Brønsted acids have been used as catalysts for aldol reactions of aldehydes with silyl enolates in organic solvents. For example: Kawai, M.; Onaka, M.; Izumi, Y. Bull. Chem. Soc. Jpn. 1988, 61, 1237.
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Kawai, M.1
Onaka, M.2
Izumi, Y.3
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14
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0013493242
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-
A precise kinetic study is currently under way
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(12) A precise kinetic study is currently under way.
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-
-
-
15
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0032506580
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3-catalyzed allylation of aldehydes in acetonitrile, and proposed the mechanism in which benzoic acid accelerated the catalyst regeneration step. Aspinall, H. C.; Greeves, N.; McIver, E. G. Tetrahedron Lett. 1998, 39, 9283.
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Aspinall, H.C.1
Greeves, N.2
McIver, E.G.3
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16
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0030952586
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(14) In their chiral Lewis acid-catalyzed Mukaiyama aldol reaction under anhydrous conditions, Evans et al. reported that addition of TMSOTf accelerated the rate-limiting catalyst turnover step. Evans, D. A.; Kozlowski, M. C.; Burgey, C. S.; MacMillan, D. W. C. J. Am. Chem. Soc. 1997, 119, 7893.
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18
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0000778261
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(16) Yamamoto et al. reported Brønsted acid-assisted chiral Lewis acids and Lewis acid-assisted Brønsted acids which were used for catalytic asymmetric Diels-Alder reactions and protonations and stoichiometric asymmetric aza Diels-Alder reactions, aldol-type reactions of imines, and an aldol reaction. (a) Ishihara, K.; Yamamoto, H. J. Am. Chem. Soc. 1994, 116, 1561.
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(b) Ishihara, K.; Kurihara, H.; Yamamoto, H. J. Am. Chem. Soc. 1996, 118, 3049.
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0030452091
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(c) Ishihara, K.; Nakamura, S.; Kaneeda, M.; Yamamoto, H. J. Am. Chem. Soc. 1996, 118, 12854.
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(f) Aggarwal, V. K.; Anderson, E.; Giles, R.; Zaparucha, A. Tetrahedron: Asymmetry 1995, 6, 1301.
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