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The authors cleverly overcome the reluctance of fluoride ions to take part in useful reactions by using a relatively reactive salt, silver fluoride, to promote bond formation between two reagents that will be familiar to organic chemists but are rarely combined.

The authors report that, when used in combination with silver fluoride, this carbonate traps the typically highly unreactive CF3-containing intermediate to form a compound called a carbamoyl fluoride.

In some respects there is a very marked difference between fluorine and the other members of the group, for, whilst sodium chloride, bromide and iodide are readily soluble in water, sodium fluoride is much less soluble; again, silver chloride, bromide and iodide are practically insoluble in water, whilst, on the other hand, silver fluoride is appreciably soluble in water.

J. Berzelius, by converting silver fluoride into silver chloride, obtained the value 19.44, and by analysing calcium fluoride the value 19.16; the more recent work of H. Moissan gives the value 19.05.

It can also be prepared in the anhydrous condition by passing a current of hydrogen over dry silver fluoride.