Patent ID: 7319173
Filing Date: 2008-01-15
Classification: C07C

Abstract:
1. A process to prepare (per)fluorohalogenethers having general formula: wherein: A and A′, equal to or different from each other, are selected among Cl, Br and H, with the proviso that A and A′ are not contemporaneously equal to H; m=1, 2; n=0, 1; with the proviso that when m=1, n=1 and when m=2, n=0; R 1 is a fluorinated substituent selected from the following groups: C 1 -C 20 linear or branched alkyl; C 3 -C 7 cycloalkyl; aromatic; C 6 -C 10 arylalkyl; C 5 -C 10 heterocyclic or alkyiheterocyclic; when R 1 is fluorinated or perfluorinated alkyl or cycloalkyl, it can optionally contain in the chain one or more oxygen atoms; when R 1 is fluorinated it can optionally contain one or more H atoms and/or one or more halogen atoms different from F; R′=(R l ) p T wherein: R l is a fluorinated or perfluonnated substituent selected from the following groups: C 1 -C 20 linear or branched alkylene, C 3 -C 7 cycloalkylene; when R l is fluorinated it can optionally contain one or more H atoms and/or one or more halogen atoms different from F; when R 1 is perfluorinated it can optionally contain one or more oxygen atoms; p =0, 1; T has the following meanings: wherein: A and A′ are as above; r=1, 2; t=0, 1; with the proviso that when r=1 then t=1 and when r=2 then t=0; R 2 has the R 1 meanings and can be equal to or different from R 1 ; wherein n′=0, 1; u′=0, 1; R 2 is as above; with the proviso that when u=0 then n′=1; when u′=1 then n′=0; by reaction of carbonyl compounds having formula: wherein: R 1 and n are as above; u=0, 1; R′ a =−(R l ) p Q wherein: R l and p are as above; wherein n′, u′ and R 2 are as above; with the proviso that when u=0 then n=1 and when u=1 then n=0; and when u′=0 then n′=1; when u′=1 then n′=0; in liquid phase, with elemental fluorine and with olefinic compounds of formula: wherein A and A′ are as above, at temperatures from −120° C. to −20° C., optionally in the presence of an inert solvent under the reaction conditions.