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Thermal reaction of 2,2′-biindenyl with Fe(CO) 5 generates (η 4 -2,2′-biindenyl)Fe(CO) 3 and a ferrole isomer of (μ,η 3 :η 3 -dibenzo[b,e]fulvalene)Fe 2 (CO) 6 . Reaction of the dianion of dibenzo[b,e]fulvalene with iron carbonyls produced a novel cyclized acyliron complex, whose structure was proven by X-ray crystallography; a mechanism is proposed for its formation. Reaction of the same dianion with (η 5 -cyclopentadienyl)Fe(CO) 2 Br generated another novel cyclic compound (C 18 H 12 )Fe(CO) 2 (C 5 H 4 ), probably via intramolecular radical attack on the η 5 -bound cyclopentadienyl ring. Treatment of dibenzo[a,d]fulvalene with Fe 2 (CO) 9 generates (η 2 -dibenzo[a,d]fulvalene)Fe(CO) 4 , (μ,η 2 :η 2 -dibenzo[a,d]fulvalene)Fe 2 (CO) 8 , and two compounds with bis(η 5 ) structures. These appear to have CO and Fe(CO) 4 groups inserted into the reactive Fe–Fe bond of (μ,η 5 :η 5 -dibenzo[a,d]fulvalene)Fe 2 (CO) 4 . |
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