in further solvent(s) suspending of CoF3 at 200. degree.C in boiling fluorohydrocarbon, addn. of 3,6-dis(difluoromethyl)-1,2-dihydro-s-tetrazine at 100-120°C by stirring in small amts., heating to 150°C; distn.;

cobalt(III) fluoride; fluorocarbons

F2 dild. with N2, at 0°C with 10 percent F2 90 percent N2 (flow rate 8.5 l/h);