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Utilization of Transition-Metal Properties To Control Polyborane Formation. Synthesis of the arachno-Diiridahexaborane(12) 2,5-{Cp*IrH}2B4H8 and Its Conversion to the nido-Diiridahexaborane(10) 1,2-{Cp*Ir}2(μ-H)B4H7 (Cp* = η5-C5Me5)

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posted on 17.12.1999, 00:00 by Xinjian Lei, Maoyu Shang, Thomas P. Fehlner
Metal-assisted borane condensation is demonstrated by the formation of the hexaborane(12) analogue arachno-2,5-{Cp*IrH}2B4H8 (3) by the reaction of two BH3·THF moieties with the metal centers of the tetraborane(10) analogue {Cp*IrH}2(μ-H)B2H5 (1). Mild thermolysis of 3, which contains separated B2H4 fragments, results in H2 elimination and the formation of the hexaborane(10) analogue nido-1,2-{Cp*Ir}2(μ-H)B4H7 (2), containing a contiguous B4H7 fragment.