Br2 in sulfolane addn. of (CF3)2Pb(CH3)Br (8 mmol) in portions to (CF3)2Cd*D (4 mmol) in sulfolane at 70°C with stirring; condensing off mixt. of (CF3)2Pb(CH3)2 and (CF3)3Pb(CH3) (ratio 1/1.5); addn. of amt. of Br2 corresponding to (CF3)2Pb(CH3)2;; pptn. after 5 d at -25°C; condensing off from ppt.;;

in neat (no solvent) react. of Pb(CH3)4 (0.5 mmol) with (CF3)4Sn (2 mmol) in glass-ampoule (sealed under high vac.) at 80°C;; not isolated, identified by 19F-NMR;;

in gas other Radiation; radio frequency radiation of mixt. of educts in a special pyrex reactor,ratio of educts: C2F6/alkyl metal = 25/1, 2h, condensation of product on a liquid N2 filled cold finger, excess C2F6 removed by vac. distn. at -100°C; sepn. by gas chromy. (10percent SE-30 on Chromosorb P);