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note
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2 (0.02 mol % vs Zn) into 95% zinc powder, purchased from Merck, Ltd., led to formation of benzyl 2-acetyl-2-methylpentanoate (3b) in 46% yield. Furthermore, the use of Le Goff's Zn-Cu couple also gave 3b in 37% yield. Although detailed studies on these phenomena have not been accomplished as yet at the present stage, trace amounts of metals such as iron, cobalt, or copper, which may be contained as the impurities in the Zn plate, may act as the catalyst for the activation of zinc. Le Goff's Zn-Cu couple was prepared by the reported method. See: Simmons, H. E.; Cairns, T. L.; Vladuchick, S. A.; Hoiness, C. M. Org. React. 1973, 20, 1.
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20
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35649014092
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2-Benzyloxycarbonyl-1-butene (1b) and 2-benzyloxycarbonyl-1-pentene (1c) were prepared by the reported method. See: Ueno, Y.; Setoi, H.; Okawara, M. Tetrahedron Lett. 1978, 39, 3753.
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0001522939
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Zn-promoted intramolecular conjugated addition of iodo enones has been previously reported. See: Bronk, B. S.; Lippard, S. J.; Danheiser, R. L. Organometallics 1993, 12, 3340.
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Ethyl zinc iodide was prepared by the reported method. See: Jensen, A. E.; Knochel, P. J. Org. Chem. 2002, 67, 79.
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