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An acentric coordination of the trihydro(tetramethylpyrrolyl) borato ligand in 1 is effected by the “small” nitrogen atom. Like the isosteric decamethylferrocene, 1 is disordered by shifting and rotation of the C5 axis in the crystal. The novel ligand of 1 could be incorporated at the Fe center of the analogous “boron-free” complex with Me2S·BH3.
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Kühn et al. (1989) studied this question.
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