Trifluoromethyl iodide is oxidised by chlorine trifluoride in C6F14 at –78 °C to give trifluoromethyliodine(V) tetrafluoride. Evidence for the formation of trifluoromethyliodine(III) difluoride has also been obtained. CF3IF4 Decomposes readily at 20 °C but is more stable in this respect than CF3IF2. Other RFIF4[RF= C2F5, (CF3)2CF, or n-C4F9] compounds are more stable with respect to decomposition than had been supposed. CF3IF4 Reacts with methylmethoxosilanes at 20 °C to give CF3IF4–n(OMe)n(n= 1–4).