Topospecific Reactions of a [5.5.5.5]Fenestradiene with [Fe2(CO)9

Abstract

AbstractN, N‐Dimethylformamide dimethyl acetal transforms an allylic OH group, which is part of a tetracyclic hydrocarbon in a unique elimination reaction into a [5.5.5.5]fenestradiene (2b → 4). In topologically selective reactions of this diene 4 with [Fe2(CO)9,], the [Fe(CO)4(η2‐diene)] and the [Fe(CO)3(η4‐diene)] complexes 8 and 9, respectively, are formed by complexation on one side of the diene moiety, whereas complexation on the other side leads to a [Fe(CO)2(Cp)] complex 10.