Thetitlecompounds6a—6fwerepreparedwithhighyieldviaintramolecularWittigreactionofmethyl3-perfluoroalkyl-6-perfluoroacyl-2-triphenylphosphoranylidenehex-3,5-dienoates(5a—5i)whichwereobtainedfromthereacitonof3-perfluoroacylprop-2-enylidenetriphenylphos-phoranes(3a—3c)withmethylperfluoroalkynoates(4a—4c).