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- W2166934187 abstract "Pentafluorophenyl propynoate (8), prepared from sodium pentafluorophenate and propynoyl chloride, on flash vacuum pyrolysis through silica gave 4,5,6,7,8-pentafluoro-2H- cyclohepta[b]furan-2-one (9). Treatment of (9) with sodium methoxide in methanol at −70°C produced a mixture of the 4-methoxy-, 5-methoxy-, 6-methoxy-, 7-methoxy- and 8-methoxy-tetrafluoro-2H-cyclohepta[b]furan-2-one compounds (10), (11), (12), (13) and (14) in the ratio 11:18:8:19:44 respectively. Under more forcing conditions, the 4,8- and 5,8-dimethoxy-trifluoro-2H-cyclohepta[b]furan-2-one compounds (15) and (16) respectively were formed. X-ray crystallography identified the 8-methoxy derivative (14), whose fluorine nmr spectrum enabled key resonances to be identified in the parent (9) and subsequently allowed the structures of all the other products to be deduced." @default.
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- W2166934187 date "1991-08-01" @default.
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- W2166934187 title "Polyfluorinated heterocyclic compounds. Part 29[1]. The synthesis of 4,5,6,7,8-pentafluoro-2H-cyclohepta[b]furan-2-one and its reaction with sodium methoxide." @default.
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- W2166934187 doi "https://doi.org/10.1016/s0022-1139(00)80958-6" @default.
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