Search results for "Dimethylsilane"
showing 9 items of 9 documents
ansa-[(tert-Butylamino)(isodicyclopentadienyl)dimethylsilane]Zr(NMe2)2prepared by an amine-elimination reaction
2003
An amine-elimination reaction was used to obtain the title compound, i.e. (N-tert-butyl-N-[[(1,2,3,3a,7a-eta)-4,5,6,7-tetrahydro-4,7-methano-1H-inden-2-yl]dimethylsilyl]amido-kappaN)bis(N-methylmethanaminato-kappaN)zirconium(IV) or [isodiCpSiMe(2)N-tert-butyl]Zr(NMe(2))(2) (Cp is cyclopentadienyl), [Zr(C(16)H(25)NSi)(C(2)H(6)N)(2)], in very good yield. Treatment of isodiCpHSiMe(2)NH-tert-butyl with Zr(NMe(2))(4) leads to the formation of a yellow solid that can be purified by sublimation. The single-crystal structure of the product shows the exo complexation of the isodicyclopentadienyl ligand to the Zr atom. The Cp portion of this ligand is bonded to the Zr atom in a eta(5) manner, with a …
Synthesis and Characterization of SiC/MC/C Ceramics (M = Ti, Zr, Hf) Starting from Totally Non-oxidic Precursors
2002
The reaction of poly(dimethylsilane) (PDMS) and poly(dimethylcarbosilane) (PCS) with bis(cyclopentadienyl)M dichloride Cp2MCl2 (M ) Ti, Zr, Hf) complexes has been used as a new route to obtain ceramic materials based on SiC-containing M. The reaction is completed at a relatively low temperature, 900 °C, yielding the corresponding amorphous SiC/MC ceramics which have been characterized by means of 29 Si MAS NMR. These amorphous materials have been treated at higher temperatures, 1350 °C, under a purified argon atmosphere, yielding partially crystallized products which have been studied by X-ray powder diffraction and 29 Si MAS NMR. The effect of the composition of the mixture of precursors is
Theoretical study of the effect of substituent and backbone conformation on the electronic properties of symmetrically substituted poly(di‐n‐alkylsil…
1994
We present the results of ab initio 3‐21G∗ geometry optimizations and valence effective Hamiltonian (VEH) band structure calculations aimed at determining the evolution of the geometric and electronic (ionization potential, electron affinities, and band gaps) properties of all‐trans poly(dimethylsilane), poly(diethylsilane), poly(di‐n‐propylsilane), and poly(di‐n‐butylsilane) when increasing the size of the alkyl group. In the latter polymer, we have also studied the 7/3 conformation, in order to analyze the effect of the backbone conformation on the geometric and electronic structure. The VEH ionization potentials of all‐trans poly(di‐n‐alkylsilanes) are almost equal, and as experimental p…
Fluoreszierende silane als OH-selektive schutzgruppen
1985
Abstract Fluorescent tertiary silanes are synthesized which, under cesium fluoride/ imidazole activation, discriminate between primary and secondary OH groups. Serine n-butylamide reacts with [5-dimethylamino(1-naphthyl)]dimethylsilane ( 1 ) and diisopropyl[5-dimethylamino(1-naphthyl)]silane ( 2 ) to form the silyl ethers (−)- l -3-[5-dimethylamino(1-naphthyl)]-dimethylsilyloxy]serine n-butylamid ( 14 ) and (−)- l -3-[diisopropyl[5-dimethylamino(1-naphthyl)]silyloxy]serine n-butylamid ( 15 ) exclusively. The silyl ethers are cleaved on treatment with H 2 F 2 , forming the corresponding fluorescent silyl fluorides. Absorption and fluorescence data as well as stability data for the hydrolysis…
CCDC 2023413: Experimental Crystal Structure Determination
2020
Related Article: Braulio Michele Puerta Lombardi, Chris Gendy, Benjamin S. Gelfand, Guy M. Bernard, Roderick E. Wasylishen, Heikki M. Tuononen, Roland Roesler|2021|Angew.Chem.,Int.Ed.|60|7077|doi:10.1002/anie.202011301
CCDC 2023411: Experimental Crystal Structure Determination
2020
Related Article: Braulio Michele Puerta Lombardi, Chris Gendy, Benjamin S. Gelfand, Guy M. Bernard, Roderick E. Wasylishen, Heikki M. Tuononen, Roland Roesler|2021|Angew.Chem.,Int.Ed.|60|7077|doi:10.1002/anie.202011301
CCDC 2023412: Experimental Crystal Structure Determination
2020
Related Article: Braulio Michele Puerta Lombardi, Chris Gendy, Benjamin S. Gelfand, Guy M. Bernard, Roderick E. Wasylishen, Heikki M. Tuononen, Roland Roesler|2021|Angew.Chem.,Int.Ed.|60|7077|doi:10.1002/anie.202011301
CCDC 2023414: Experimental Crystal Structure Determination
2020
Related Article: Braulio Michele Puerta Lombardi, Chris Gendy, Benjamin S. Gelfand, Guy M. Bernard, Roderick E. Wasylishen, Heikki M. Tuononen, Roland Roesler|2021|Angew.Chem.,Int.Ed.|60|7077|doi:10.1002/anie.202011301
A doubly bridged isodicyclopentadienyl zirconium complex: bis{N-(3,5-dimethylphenyl)-N-[(η5-isodicyclopentadien-2-yl)dimethylsilyl]amido-κN}zirconium…
2002
Transmetallation of the dilithium salt of (3,5-dimethyphenylamino)(isodicyclopentadienyl)dimethylsilane by treatment with zirconium tetrachloride in a 2:1 ratio leads to the substitution of all four chloride ligands. With the applied stoichiometry, the title complex, [Zr(C(20)H(25)NSi)(2)].C(4)H(10)O, was obtained and crystallized from diethyl ether. X-ray diffraction characterization showed that both isodicyclopentadienyl ligands (alternatively called 4,5,6,7-tetrahydro-4,7-methano-1H-indene) are complexed to the metal on their exo face in a completely stereoselective manner and that they are eta(5)-bonded to the Zr atom.