Amide routes starting from either Ta(NMe2)5 or (C2B9H11)Ta(NMe2)3 have been employed to synthesize the first tantalasilsesquioxanes including the “half-sandwich” complex Cy7Si7O12Ta(NMe2)2 (3, Cy = c-C6H11), the anionic “sandwich” complex [H2NMe2][Ta(Cy7Si7O12)2] (4) as well as the novel “mixed-sandwich” complex Cy7Si7O12Ta(C2B9H11) (5) with the latter being the first example of a carborane/silsesquioxane hybrid compound.
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Fei et al. (2002) studied this question.
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