139039-99-9Relevant academic research and scientific papers
Iridium Pincer Catalysts for Silane Dehydrocoupling: Ligand Effects on Selectivity and Activity
Mucha, Neil T.,Waterman, Rory
supporting information, p. 3865 - 3872 (2015/08/19)
Catalytic reactions of bisphosphinite pincer-ligated iridium compounds p-XR(POCOP)IrHCl (POCOP) [2,6-(R2PO)2C6H3, R = iPr, X = H (1); R = tBu, X = COOMe (2); = H (3); = NMe2 (4)] with primary and secondary silanes have been performed. Complex 1 is primarily a silane redistribution precatalyst, but dehydrocoupling catalysis is observed for sterically demanding silane substrates or with aggressive removal of H2. The bulkier compounds (2-4) are silane dehydrocoupling precatalysts that also undergo competitive redistribution with less hindered substrates. Products generated from reactions utilizing 2-4 include low molecular weight oligosilanes with varying degrees of redistribution present or disilanes when employing more sterically demanding silane substrates. Selectivity for redistribution versus dehydrocoupling depends on the steric and electronic environment of the metal but can also be affected by reaction conditions. (Chemical Equation Presented).
Synthesis, structure and photoluminescence of 1,2-disila-acenaphthene Si2C10H10 and 1,2-diaryldisilane reference compounds
Soeldner, Marcus,Sandor, Mario,Schier, Annette,Schmidbaur, Hubert
, p. 1671 - 1676 (2007/10/03)
For the synthesis of the diaryldisilanes Ar-SiH2SiH2-Ar (la, Ar = phenyl; Ib, Ar = p-tolyl; le, Ar = mesityl; Id, Ar = p-anisyl) two convenient preparative routes are reported. The crystal structures of le and Id have been determined in Xray diffraction studies; the disilanes have a staggered transconformation with a crystallographically imposed center of inversion. For la-d no photoluminescence phenomena can be observed. 1,2-Disila-acenaphthene (2) is synthesized in acceptable yield by treatment of 1,8-dilithionaphthalene with 1 equivalent of l,2-bis[((trifluoromethyl)sulfonyl)oxy]disilane Tf-SiH2SiH2-Tf. The crystal structure of 2 has also been determined by X-ray diffraction. The molecule has no crystallographically imposed symmetry but closely follows the symmetry elements of point group C2v. Solutions of 2 exhibit intense fluorescence in the near UV region at room temperature. The fluorescence spectra are discussed in comparison with data on acenaphthene and naphthalene. WILEY-VCH Verlag GmbH 1997.
