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See Ref. 7e.
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63
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33646142092
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The formation of insoluble solid side products has also been observed in the Michale addition of ketones to β-nitrostyrenes, see:
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The formation of insoluble solid side products has also been observed in the Michale addition of ketones to β-nitrostyrenes, see:. Mase N., Watanabe K., Yoda H., Takabe K., Tanaka F., and Barbas III C.F. J. Am. Chem. Soc. 127 (2006) 4966
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Barbas III, C.F.6
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note
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Usually better results could be obtained in the presence of tertiary amine-thiourea catalyst with strong electron-withdrawing group.
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34248175419
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note
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In the reaction of 2b and 3a catalyzed by modified cinchona alkaloid 86% ee was obtained, see Ref. 7a.
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note
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Although the formation of racemic product from 2g and 3a catalyzed by 1c is not clear yet, the following plausible catalytic model might account for the observed results.{A figure is presented}
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