Patent ID: 6835856
Filing Date: 2004-12-28
Classification: C07C

Abstract:
A process for the preparation of (per)fluorohalogenethers having general formula (I):(R)nC(F)mOCAFâ€”CAâ€²F2â€ƒâ€ƒ(I) wherein:A and Aâ€², equal to or different the one from the other, are Cl or Br or one is selected from A and Aâ€² and hydrogen and the other is halogen selected from Cl, Br; R=F or a fluorinated substituent, selected from: linear or branched C1-C20 alkyl; C3-C7 cycloalkyl; aromatic, C6-C10 arylalkyl, alkylaryl; C5-C10 heterocyclic or alkylheterocyclic; when R is fluorinated or perfluorinated alkyl, cycloalkyl, arylalkyl, alkylaryl, it can optionally contain in the chain one or more oxygen atoms; when R is fluorinated it can optionally contain one or more H atoms and/or one or more halogen atoms different from F; n is an integer and is 1 or 2; m=3-n; by reaction of carbonyl compounds having formula (II):(R)pC(F)q(O)â€ƒâ€ƒ(II) wherein:p is an integer and is 1 or 2; q is an integer and is zero or 1, with the proviso that when p=2, q=0; when p=1, q=1; R is as above; in liquid phase with elemental fluorine and with olefinic compounds having formula (III):CAF&boxH;CAâ€²Fâ€ƒâ€ƒ(III) wherein A and Aâ€² are as above, operating at temperatures from âˆ’120Â° C. to âˆ’20Â° C., optionally in the presence of a solvent inert under the reaction conditions.