A sixfold alkyl chain extension, the reaction of 1 with tBuOK and H2CCHCH2Br in THF to give 2, was achieved in one step in quantitative yield. The FeII center of 2 can be completely and reversibly reduced but not oxidized (with Br2). Instead, bromine adds in a 1,3 fashion to all terminal CC bonds. The hexaalkylbenzene ligand can be released from 2 by irradiation. [Fe] = [(η5‐C5H5)Fe]⊕.
The C-0 bond of Fe(q5-C5H5)+ complexes of aryl ethers is cleaved smoothly by reaction of ButOK in THF or KOH in DME, yielding n-phenate complexes; transetherification can also be achieved in situ at room temperature.
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