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2/LiCl-Catalyzed reaction of 2,4-pentadienyl propiolate derivatives has been reported to give intramolecular carbochlorination products, see: Y.I.M. Nilsson, R.G.P. Gatti, P.G. Andersson, and J.E. Backvall Tetrahedron 52 1996 7511
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50
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30344460810
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note
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2O.
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51
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30344486121
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note
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Neither THF nor acetone were effective sovents for the cyclization. The reason for the difference in the efficiency of the fluorinated alcohols and the other polar solvents is unclear.
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0033011059
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2O or DMSO is highly efficient in intramolecular cyclizations of ester compounds. M.E. Jung Synlett 1999 843
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Synlett
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Jung, M.E.1
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55
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30344443804
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See, Refs. 13a and 13d.
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Rhodium chloride complex such as Willkinson's catalyst accelerates the [4+2] cycloadditon of 1,3-diene-8-yne or 1,3,8-triene derivatives in TFE. It has been suggested that TFE enhances the polarizability of the Rh-Cl bond. See, Refs. 13a and 13d.
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