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Abstract
The significant recent findings in our laboratory are as following: (1) The synthesis and crystal structure of the first “carbons apart” C4B8-carborane provided an indirect evidence for the existence of a carborane cuboctahcdron, a geometry that was proposed by Lipscomb in 1960 as an intermediate in his classic DSD mechanism for the thermal rearrangement of ortho-carborane to meta-carborane. (2) The first examples of fully sandwiched anionic lithia- and magnesacarboranes and half-sandwich cesia- and magnesacarboranes have been synthesized and structurally characterized. (3) A number of half- and full-sandwich galla- and indacarboranes were synthesized and their reactivities at the metal center for further complexation were explored. (4) The lanthanide metal reagents exhibited a different reactivity pattern with the “carbons apart” carborane ligands than with the corresponding “carbons adjacent” counterparts and further exemplify the role of solvents in determining the course of reactions in these systems.