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(b) Grieco, P.A.; Oguri, T.; Wang, C.J.; Williams, E. J. Org. Chem. 1977, 42, 4113.
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Williams, E.4
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66
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and references cited therein
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For a review of the cyclopropanation of allylic alcohols with iodomethyl-zinc reagents, see: Charette, A.B.; Marcoux J.-F. Synlett 1995, 1197 and references cited therein.
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Synlett
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Charette, A.B.1
Marcoux, J.-F.2
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67
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For a review of substrate-directable chemical reactions, see: Hoveyda, A.H.; Evans, D.A.; Fu, G.C. Chem. Rev. 1993, 93, 1307.
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Aristoff, P.A.1
Johnson, P.D.2
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76
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85033125264
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note
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4.
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78
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85033126200
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note
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Materials and Methods. All reactions were carried out in flame-or oven-dried glassware under an argon atmosphere with dry, freshly distilled solvents, unless otherwise indicated. Tetrahydrofuran and diethyl ether were distilled under argon from sodium/benzophenone. Dichloromethane was distilled from calcium hydride. Triethylamine, diisopropylamine, N,N-diisopropylethylamine, DBU, and DMPU were dried and distilled from calcium hydride and stored over KOH. Anhydrous t-butanol and nitromethane were dried and distilled from calcium hydride and stored over 4-Å molecular sieves. Methyllithium was purchased from Aldrich and standardized by titration with diphenylacetic acid. All reactions were monitored by TLC using E. Merck 0.25-mm precoated silica gel plates. Flash chromatography was performed with the indicated solvents and silica gel-60 (particle size 0.040-0.062 mm) supplied by E. Merck. Yields refer to chromatographically and spectroscopically pure compounds unless otherwise stated. The instrumentation described in ref 1 was again em3 ployed in this work.
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79
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Preparation of zinc-copper couple: LeGoff, E. J. Org. Chem. 1964, 29, 2048. Following the acetic acid wash described by LeGoff, the zinc-copper couple was washed with water (5×), ethanol (4×), and then ether (5×).
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(1964)
J. Org. Chem.
, vol.29
, pp. 2048
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LeGoff, E.1
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80
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85033116114
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note
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The buffer solution was prepared by addition of 3 M aqueous formic acid (25.8 mL) to 3 M KOH (9.6 mL) and dilution to 100 mL.
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