at 10E-4-10E-5 Torr, high excess of aromatics, react. container at -196°C, inlets for organic educts heated to let them as vapor. Cr vaporized at ca 1600-1800°C for 60-80 min.; filtrn., chromy. in two steps (SiO2, benzene and benzene:ether=20:1), elem. anal.;
