Reaction of Hypercoordinate Dichlorosilanes Bearing 8-(Dimethylamino)-1-naphthyl Group(s) with Magnesium: Formation of the 1,2-Disilaacenaphthene Skeleton
Migration of NMe(2) from C(naphthyl) to Si and Si-Si and Si-C bond formation to give a 1,2-disilaacenaphthene skeleton occurred in the reaction of hypercoordinate dichlorosilanes bearing the 8-(dimethylamino)-1-naphthyl group with two equivalents of magnesium [e.g., Eq. (a)]. The intermediate was isolated as the 1-isopropoxy derivative after quenching the reaction mixture with isopropyl alcohol.
Polymers containing backbone acetylene, anthracene and tetra-, penta- or hexa-coordinate silicon units: UV–visible, photoluminescence and solution χ(3) non-linear optical properties
作者:William E. Douglas、Daniel M. H. Guy、Ajoy K. Kar、Changhai Wang
DOI:10.1039/a805518a
日期:——
Poly(aryleneethynylenesilylene)s of general structure (CCSiR2CCX)n (X = 9,10-anthrylene) containing tetra-, penta- or hexa-coordinate silicon exhibit high Ï(3) values, the absorbance and emission spectra being red-shifted with respect to those for the corresponding monomers R2Si- (CCAr)2 (Ar = 9-anthryl); these properties are consistent with extensive through-Si conjugation along the backbone.
Pentacoordinate silicon compounds: Stereochemical non-rigidity of chelates formed by intramolecular ring-closure. Crystal structure of 8-dimethylamino-1-trifluorosilylnaphthalene
non-rigidity in pentacoordinate chelated organosilicon compounds is described. It is shown that in the compounds Me2iXYZ, non-dissociative ligand permutation at silicon can be distinguished unambiguously from processes associated with rupture of the chelate ring and nitrogen inversion. The crystal and molecular structure of 8-Me2NC10H6SiF3 has been determined. Pentacoordination of the silicon atom is confirmed