CF3SOBF + C,H,O- + CF,SO&H, Instead, only diethyl ether was produced by 0-ethylation of the ethoxide ion: ... CF,S03C2H, + C,H50”' + (C,H&O + CF,S03- Ethyl trifluoromethanesulphonate must therefore ethytate ethoxide ion more rapidly than this ion reacts with the acid fluoride. The same authors* showed that methyl trifluoromethanesulphonate ... 0-alkylate diethyl ether to give methyl ethyl ether and that the ethyl ester reacted with benzene to give ethyl- and diethyl- ...