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The deprotonation of (p-H)Fe3(CO)g(p-CO) (p3-HBH) with n-butyllithium yields the dianionic complex [Li]2[Fe3(C0)9(p3-HBCO)], which has been spectroscopically characterized. In contrast to the facile reprotonation of closely related ferraboranes, protonation of [LiIz[Fe3(CO)g(p3-HBCO)] leads to decomposition. On the other hand, reaction of this dianionic complex with 2 equiv of FeCl3 gives a good yield of [Li] [ F~~( C O )~( C~-C O ) (~~-H B C~) . Metathesis with [AsPhJ-[Cl] yields [AsPh] [ F~~( C O ) S (~-C O ) (~~-H B C~) ], which has been crystallographically characterized (triclinic, Pi, a = 9.534(3) A, b = 13.305(4) A, c = 15.225(4) A, a = 104.39(2)', /? = 103.56(2)', y = 99.23(2)', V = 1768.7(8) A3, 2 = 2). Comparison with the analogous osmium clusters, as well as isoelectronic organometallic clusters, reveals relationships among their structures, properties, and energetics.

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