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The acidity of such 4-hydroxypyran-2-ones is comparable to that of acetic acid: Ferri, D.; Bürgi, T.; Baiker, A. J. Chem. Soc Perkin Trans. 2 2002, 437-441.
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The acidity of such 4-hydroxypyran-2-ones is comparable to that of acetic acid: Ferri, D.; Bürgi, T.; Baiker, A. J. Chem. Soc Perkin Trans. 2 2002, 437-441.
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29
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34447305053
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Pyrone 14 could also be acetylated in 69% yield (see Supporting Information), yet this protecting group turned out to be unstable in the subsequent transformations.
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Pyrone 14 could also be acetylated in 69% yield (see Supporting Information), yet this protecting group turned out to be unstable in the subsequent transformations.
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3 was employed.
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3 was employed.
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52
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84981786851
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For a study on the oxidative addition of benzyl halides to Ni(0) complexes leading to formation of dibenzyl, see: Bartsch, E.; Dinjus, E.; Fischer, R.; Uhlig, E. Z. Anorg. Allg. Chem. 1977, 433, 5-12.
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For a study on the oxidative addition of benzyl halides to Ni(0) complexes leading to formation of dibenzyl, see: Bartsch, E.; Dinjus, E.; Fischer, R.; Uhlig, E. Z. Anorg. Allg. Chem. 1977, 433, 5-12.
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53
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0000679543
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For other examples of protiodepalladations, see
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For other examples of protiodepalladations, see: Voigt, K.; von Zezschwitz, P.; Rosauer, K.; Lansky, A.; Adams, A.; Reiser, O.; de Meijere, A. Eur. J. Org. Chem. 1998, 1521-1534.
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0001291117
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For an example of a copper-catalyzed 1,4-addition to an enone in which a slight variation of the substrate completely inverted this selectivity, see
-
For an example of a copper-catalyzed 1,4-addition to an enone in which a slight variation of the substrate completely inverted this selectivity, see: Lipshutz, B. H.; Dimock, S. H. J. Org. Chem. 1991, 56, 5761-5763.
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Baba, S.1
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All these compounds slowly start to decompose even when stored either neat or in solution at -18°C.
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All these compounds slowly start to decompose even when stored either neat or in solution at -18°C.
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