Esterified B12 icosahedra with totally organoderivatized surfaces are obtained from the reaction of [closo‐B12(OH)12]2− with acetic anhydride or benzoyl chloride. The resulting “closomers”, in which each cluster vertex is substituted with an organic ester moiety, can provide camouflaged modules of variable size, shape, charge, hydrophobicity, etc. and represent the first examples of this structural motif known in chemistry. The figure displays, in a space‐filling representation, the result of an X‐ray analysis performed with the dodecabenzoate ester derivative.

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This paper presents the first crystallographically characterized, contiguous series of 4-coordinate transition metal compounds having a common organometallic ligand set and differing only in the identity and oxidation state of the metal. This series spans from d7 to d9 with overlapping examples for d8. M = Co(II), Ni(II), Cu(III), and Cu(II).

The lipophilic cobalt dicarbollide anion has found uses as a weakly coordinating ion for use with Ziegler−Natta catalysts and for the extraction of dangerous radioactive isotopes from nuclear waste. A hexamethyl derivative is described which should have similar or enhanced lipophilicity, as well as methyl groups which block the B-verticies most likely to coordinate to cations or function as reaction sites during γ-ray irradiation.