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The title compounds 6a—6f were prepared with high yield via intramolecular Wittigreaction of methyl 3-perfluoroalkyl-6-perfluoroacyl-2-triphenylphosphoranylidenehex-3,5-dienoates(5a—5i)which were obtained from the reaciton of 3-perfluoroacylprop-2-enylidenetriphenylphos-phoranes(3a—3c)with methyl perfluoroalkynoates(4a—4c).