Lossen; Treibich
Justus Liebigs Annalen der Chemie, 1906 , vol. 348, p. 324
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Lossen; Treibich
Chem. Zentralbl., 1901 , vol. 72, # II p. 192
in tetrahydrofuran treating Fe-complex with Br2 at -78°C (mixture turning red); allowing to reach ambient temp.; removing solvent in vac.; suspending in ether, centrifusion, removing ether in vac.; chromy. under Ar (silica gel, 1:5-EtOAc/hexane);