C 5 (CH 2 Ph) 5 H, C 5 Bz 5 H, 1, the precursor of the useful C 5 Bz 5 ligand that was introduced by Rausch, has been synthesized in 85% yield, a slight improvement over the 62% yield very recently reported by Rausch. [Fe(C 5 Bz 5 )(CO) 2 ], 2, also reported by Rausch, could be obtained in 72% yield as the only product of the reaction between 1 and [Fe(CO) 5 ] at 90 °C for 4 days. Reaction of 1 with Br 2 gives [Fe(C 5 Bz 5 )(CO) 2 Br], 3, in 84% yield. Photolysis of 3 in THF using visible light in the presence of Na + S 2 CNMe 2 -(Na + dtc -) gives a 73% yield of [Fe(C 5 Bz 5 )(CO)(η 2 -dtc)], 4, whose oxidation by [FeCp 2 ] + PF 6 -gives the 17electron complex [Fe III (C 5 Bz 5 )(η 2 -dtc)(NCMe)] + PF 6 -, 5, the precursor of [Fe IV Cp*(η 2 -dtc) 2 ] + -PF 6 -, 7. Cyclic voltammetry studies of the C 5 Bz 5 -iron complexes show that the electronic properties of C 5 Bz 5 are intermediate between those of C 5 H 5 (Cp) and C 5 Me 5 (Cp*) and that C 5 Bz 5 destabilizes paramagnetic iron complexes as opposed to the stabilizing property of Cp*.
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