The sterically overcrowded diarylsilanes, (Rind) 2 SiH 2 and (Rind) 2 SiBr 2 , with the two bulky Rind groups (Rind: 1,1,3,3,5,5,7,7-octa-R-substituted s-hydrindacen-4-yl) have been synthesized by the coupling reaction of the Rind-substituted monochlorosilanes, (Rind)SiH 2 Cl, with (Rind)Li followed by bromination of the SiH bonds. The key intermediates, (Rind)SiH 2 Cl, have been obtained by the reactions of the trihydrosilanes, (Rind)SiH 3 , with trichloroisocyanuric acid. The structural features of (Rind) 2 SiH 2 and (Rind) 2 SiBr 2 have been fully characterized by NMR spectroscopy and X-ray diffraction studies.
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