Mercury and lithiumreact with trifluoromethyl hypofluorite at room temperature to give carbonyl fluoride and the fluorides of the metals. Nickel, pretreated with fluorine, is not appreciably attacked by trifluoromethyl hypofluorite below 470". Above this temperature nickel is attacked and the reactive gas appears to be Fz rather than CROF. Trifluoromethyl hypofluorite reacts with lithium carbonate at room temperature to give carbon dioxide, ...