in neat (no solvent) reaction for 30 to 35 h in sealed tube (Mo or pyrex glass) at 450 to 500°C, ampuls are heated in autoclave filled with N2 or CO2 at 20 atue;;
参考文献
Shchukarev, S. A.; Kolbin, N. I.; Byabov, A. N.
Vestn. Leningr. Univ. Ser. Fiz. i Khim., 1961 , # 4 p. 100 - 104
C. A., 1961 , p. 15200
N2-stream loaded with Br2 is passed over a mixt. of dry HfO2 with the 3-fold amount sugarcoal at yellow heat;; HfBr4 is condensed by water cooling, sublimation in vacuum;;
