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Formal 1,2-migrations of acyloxy (Surzur, J.-M.; Tessier, P. C. R. Acad. Sci. Fr. Ser. C 1967, 264, 1981-1984; Bull. Soc. Chim. Fr. 1970, 3060-3070) and related groups have been studied extensively, although a coherent mechanistic picture has not yet emerged, see inter alia: (a) Crich, D.; Filzen, G. F. J. Org. Chem. 1995, 60, 4834-4837. (b) Beckwith, A. L. J.; Duggan, P. J. J. Chem. Soc., Perkin Trans. 2 1992, 1777-1783 and references there cited.
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Formal 1,2-migrations of acyloxy (Surzur, J.-M.; Tessier, P. C. R. Acad. Sci. Fr. Ser. C 1967, 264, 1981-1984; Bull. Soc. Chim. Fr. 1970, 3060-3070) and related groups have been studied extensively, although a coherent mechanistic picture has not yet emerged, see inter alia: (a) Crich, D.; Filzen, G. F. J. Org. Chem. 1995, 60, 4834-4837. (b) Beckwith, A. L. J.; Duggan, P. J. J. Chem. Soc., Perkin Trans. 2 1992, 1777-1783 and references there cited.
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10244254153
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note
-
Typical experimental procedure: A solution of the xanthate (1 mmol) in degassed cyclohexane (7 mL) or a 9:1 mixture of cyclohexane and 1,2-dichloroethane was heated under reflux and lauroyl peroxide was added portionwise (2% every 2 h) until the starting material was consumed (6-15% was needed depending on the substrate). The solvents were evaporated under reduced pressure, and the residue purified by chromatography on a silica gel column to afford the deoxygenated derivative.
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