The novel carborane ~-1,2-trimethylene-l,2-dicarba-closo-dodecaborane(l0) has been prepared and characterized. The carborane was found to undergo base degradation to form the p-1,2-trimethylene-(3)-1,2-dicarbadecahydro-nido-undecaborate(1 -) ion which after deprotonation would react with transition metals to form several sandwich-bonded complexes of the type [M"+(BgC5H15)2]m-4 and (C5H5)M1II(BC5Hl5). The formal nickel(1V) and cobalt(II1) complexes were found to undergo thermal rearrangements and the kinetics of the facile ligand isomerizations of Ni(B9C5H1& were determined using reverse current chronopotentiometry and visible spectroscopy.he (3)-1,2-dicarbollide ion3-6 has been shown to

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Biscarborane, l-[l'-l',2'-dicarba-tioso-dodecaborane( 12)]-1,2-dicarba-c/oso-dodecaborane( 12), I, has been found to act as a novel chelating agent with transition metal ions, forming

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Notes R = Me), to determine the minimum size of substituents in the blocking positions on the borazine ring for prevention of free rotation of tolyl groups.