Radiotracers in fluorine chemistry. Part II. Fluorine-18 exchange between carbonyl fluoride and Group I fluorides. Effect of dipolar, aprotic solvents

Abstract

Fluorine-18 exchange between carbonyl fluoride and Group I fluorides (Cs–Li inclusive) varies in the order Cs > Rb K > Na, Li at 423 K, and in the order Cs > Rb K, Na, Li at 323 K. Exchange is enhanced in the presence of acetonitrile or diglyme, the effect of the latter being particularly marked for LiF and NaF, but not in the presence of benzene or diethyl ether. The results are discussed in terms of the solvents' properties.