| 摘要 |
Perfluorinated carboxylic acid fluorides which also have an ester group in the molecule are prepared by decomposition of perfluorinated fluorosulfato compounds of the formula I <IMAGE> (I) in which R=alkyl, aryl or aralkyl with preferably up to 10 C atoms, in particular CH3 l or C2H5, m=an integer from 1 to 10, preferably 1 to 8 and in particular 1 to 6, and n=0 or an integer from 1 to 10, preferably 0 to 3 or in particular 0 or 1, in the presence of catalytic amounts of at least one alkali metal fluoride and in the absence of solvents; the compounds have the formula II <IMAGE> (II) in which R, m and n have the same meaning as in formula I. The compounds II are valuable intermediates, in particular for the preparation of perfluorinated vinyl compounds, which can in turn be processed to homopolymers and copolymers which are exceptionally stable to chemicals or heat.
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