Method for the preparation of poly (carbonoyl fluoride) oligomers

In a method for preparing poly (carbonyl fluoride) oligomers comprising the steps of introducing a reaction mixture of F-3-methylbutene-1 and oxygen into an evacuated reaction vessel;

• subjecting said reaction mixture to a source of ultraviolet radiation for a period of time sufficent to effect a photolytic reaction between the components of said mixture;
• and separating the resulting reaction products;
• the improvement which comprises the addition of a minor amount of bis(trifluoromethyl)trioxide to said reaction mixture as a reaction initiator.