Swamy, K. C. Kumara published the artcilePentacoordinated molecules. 79. Pentacoordinate acyclic and cyclic anionic oxysilicates. A silicon-29 NMR and x-ray structural study, Recommanded Product: Difluorodiphenylsilane, the publication is Journal of the American Chemical Society (1990), 112(6), 2341-8, database is CAplus.
Variable temperature 29Si NMR spectral measurements revealed the formation of acyclic anionic silicates, [Rn‘Si(OR)5-n][K,18-crown-6], n = 0-3, from reactions of alkoxy and aryloxysilanes with the resp. potassium alkoxide or potassium aryloxide in the presence of 18-crown-6. This elusive class of substances has been proposed as model intermediates in the sol-gel process. In the case of [PhSi(OCH2CF3)4][K,18-crown-6], isolation as a crystalline solid was achieved. The 29Si chem. shifts move progressively downfield from Si(OR)5– to R’Si(OR)4– to R2‘Si(OR)3–. Pentaalkoxysilicate anions react rapidly with pinacol to form the corresponding five-coordinated bicyclic anionic silicate. Independent synthesis and an x-ray structural study verified the formation of the bis(pinacolate) [(OCMe2CMe2O)2SiOCHMe2][K,18-crown-6] (I). For comparison of structural distortions, the synthetic and x-ray characterization of the related anionic oxysilicates [(C6H4(CF3)2CO)2SiR][Et4N] (II) and [(C6H4O2)2SiR][Me2NH2] (III) (R = cyclohexyl) are reported. The structures of I and II are trigonal-bipyramidal and that of III is rectangular-pyramidal.
Journal of the American Chemical Society published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C9H9F5Si, Recommanded Product: Difluorodiphenylsilane.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia