Process for the preparation of 2-perfluoropropoxy-perfluoropropionyl fluoride
AssigneeAusimont S.p.A.
InventorsGiorgio Bornengo, Filippo M. Carlini, Michele Pontevivo, Giorgio Guglielmo
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Abstract
Process for the preparation of 2-perfluoropropoxy-perfluoropropionyl fluoride by dimerization of hexafluoropropene epoxide in aprotic polar medium, in the presence of N,N,N',N'-tetrasubstituted diaminodifluoromethane as catalyst, characterized in that the dimerization reaction is carried out in the presence of a co-catalyst constituted by a nitrogenous organic base having structure of aniline, or of pyridine, or of a derivative thereof, wherein the nitrogen atom is not linked to hydrogen atoms and, in the case of the pyridine-type structure, it is sterically hindered by substituent groups on ortho-position relatively to it.
Claims5
Process for the preparation of 2-perfluoropropoxyperfluoropropionyl fluoride by dimerization of perfluoropropene epoxide in an aprotic polar solvent selected from the group consisting of ethers, nitriles and dimethylformamide, at temperatures comprised within the range of from -50.degree. C. to +50.degree. C., in the presence of a catalyst comprising an N,N,N',N'-tetrasubstituted diaminodifluoromethane and a co-catalyst comprised within the following formulae:
- ##STR6## wherein R.sub.5, R.sub.6, R.sub.7, R.sub.8, and R.sub.9, equal to or different from each other, are a hydrocarbon radical containing from 1 to 8 carbon atoms, which can either contain or not contain a substituent group inert towards the reactants under the reaction conditons;
- R.sub.7 can be also H;
- R.sub.7 and R.sub.8 can furthermore be linked to each other to form a second ring of 5 or 6 carbon atoms and which can either aliphatic or aromatic;
- X.sub.1, X.sub.2, X.sub.3, X.sub.4, and X.sub.5, equal to or different from each other, can be H, halogen or a hydrocarbon radical of from 1 to 8 carbon atoms, which can either contain or not contain a substituent group inert towards the reactants under the reaction conditions, said co-catalyst being used in amounts comprised within the range of from 0.001 to 10 mol/perfluoropropene epoxide mol.
Dependencies are inferred from the claim text.