Aug. 20, 1962 POLYFLUORINRTED cU, P-UNSA4TUR. 4TED ACIDS AND ESTERS 3155 and XI1 with diethyl malonate, the Reformatsky reaction of I1 with ethyl difluoroacetate, and the Grignard reaction of I1 with methylmagnesium iodide were carried out. Compound I1 underwent reaction with diethyl malonate to give the neopentyl derivative XIII, identified by hydrolytic decarboxylation to the diacid XIV, from which the corresponding anhydride XV ...