The last method involving the fluorides of tungsten and molybdenum are reported by Green and Gard to be very simple and effective routes to large quantities of pure . They reported 100% yield when the reactions were conducted at 120 °C. As expected from the relative reactivities of and , the molybdenum reaction proceeded more readily than did the tungsten.Green, P. J.; Gard, G. L. (1977) "Chemistry of Chromyl Fluoride. 5. New Preparative routes to CrO2F2," Inorg. Chem. 16(5), 1243–1245, .
