PUB - Publikationen an der Universität Bielefeld

Reactions of tetracarbonyl(1,1',3,3'-tetra-tert-butyl-5,5'-pentafulvalene)diiron (1) with the halides bromine and iodine, and with the reagent HCl/O2, respectively, lead under cleavage of the iron-iron bond to the fulvalene-bridged dinuclear dicarbonyl-halide complexes (eta-5:eta-5-(t)Bu4C10H4)(CO)4Fe2X2, with X = Br (2), I (3), and Cl (4). By reaction of 3 with the nucleophiles CH3MgI, C6H5CH2MgBr and C5H5Na, compounds of the type (eta-5:eta-5-(t)Bu4C10H4)(CO)4Fe2R2 with R = CH3 (5), CH2C6H5 (6), and C5H5 (7) are formed. Treatment of 1 with potassium graphite, C8K, yields the dipotassium diferrate 8. Reactions of 8 with AsBr3 and SbBr3, respectively, lead to the metal complexes (eta-5:eta-5-(t)Bu4C10H4)(CO)4Fe2(ElBr2)2, with El = As (9), and Sb (10). It can be asumed that in all derivatives of 1 a cisoid orientation of the iron centers is maintained.