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18244424282
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35348914069
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4 is generated in situ from ruthenium(III) chloride, see:
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27
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0000204205
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The yield of diketone increased when pH was controlled to reduce the corresponding cleavage reaction of 1,2-diketone compound, see:
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The yield of diketone increased when pH was controlled to reduce the corresponding cleavage reaction of 1,2-diketone compound, see:. Lee D.G., and Chang V.S. J. Org. Chem. 44 (1979) 2726
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28
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0037134880
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Modifying the experimental conditions with l-proline-induced intramolecular aldol reaction in good yields because compound 14 contains acidic proton at C-2 which can be easily eliminated to give the conjugated carbonyl as side product, see:
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Modifying the experimental conditions with l-proline-induced intramolecular aldol reaction in good yields because compound 14 contains acidic proton at C-2 which can be easily eliminated to give the conjugated carbonyl as side product, see:. Northrup A.B., and MacMillan D.W. J. Am. Chem. Soc. 124 (2002) 6798
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29
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35348913452
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note
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2=0.2788 for 9714 reflections [I>2σ(I)]; temp=293(2) K; the crystal structure for 19 has been deposited at the Cambridge Crystallographic Data Centre and allocated the deposition number CCDC 641936.
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30
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35348827658
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note
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Products 14 and 17 display optical activity, presumably as a function of employing l-proline for the aldol cyclization. We were unable to assign the absolute stereochemistry of the major enantiomer.
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34
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33745612701
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Giraud A., Provot O., Franc J., Peyrat O., Alami M., and Brion J.D. Tetrahedron 62 (2006) 7667
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