Carbonyl and ester C–O bond hydrosilylation using κ<sup>4</sup>-diimine nickel catalysts
作者:Christopher L. Rock、Thomas L. Groy、Ryan J. Trovitch
DOI:10.1039/c8dt01857j
日期:——
complete ester C–O bond hydrosilylation was observed within 30 min at 25 °C to generate propylene and PhSi(OAc)3. The scope of this reaction was expanded to include six additional allyl esters, and under neat conditions, turnover frequencies of up to 990 h−1 were achieved. This activity is believed to be the highest reported for transition metal-catalyzed ester C–O bond hydrosilylation. Proposed mechanisms
Difunctional disilanes of the general type XR2SiSiR2X (1–5) (X = OMe, H; R = Me, Ph, H) have been synthesized by electrolysis of the appropriate chlorosilanes XR2SiCl in an undivided cell with a constant current supply and in the absence of any complexing agent. Reduction potentials of the chlorosilane starting materials derived from cyclic voltammetry measurements were used to rationalize the results
通用类型XR 2 SiSiR 2 X(1-5)(X = OMe,H; R = Me,Ph,H)的双官能乙硅烷是通过在恒定的不分隔电池中电解合适的氯硅烷XR 2 SiCl合成的在没有任何络合剂的情况下供电。由循环伏安法测量得出的氯硅烷原料的还原电位用于合理化制备性电解的结果。通式的MeO(ME的有机官能硅烷2)的SiC 6 H ^ 4 Y(图6a - Ç,7)随后通过反应得到的符号-对二甲氧基四甲基乙硅烷(1)在对位芳基溴化物BrC 6 H 4 Y(Y = OMe,NEt 2,NH 2)存在下具有NaOMe 。
Rapid, Highly Linear-Selective Dehydrocoupling of Phenylsilane with New Group 4 Metallocene-Based Combination Catalysts
作者:Hee-Gweon Woo、Sun-Jung Song
DOI:10.1246/cl.1999.457
日期:1999.6
The dehydrocoupling of phenylsilane with Cp′2MCl2/Red-Al (Cp′ = C5H5 or C5Me5; M = Ti, Zr, Hf; Red-Al = Na[H2Al(OCH2CH2OMe)2]) cormbination catalysts rapidly produces linear polyphenylsilanes, and the linear selectivity drastically decreases in the order of Cp(C5Me5)Hf > Cp2Hf > Cp(C5Me5)Zr > Cp2Zr > Cp2Ti; in the presence of solvent (neat > toluene > THF) and 4 Å molecular sieve; with heating.
Chlor-, Brom- und Iodtrisilane: Synthesen und 29Si-Kernresonanzspektren
作者:Karl Hassler、Wolfgang Köll
DOI:10.1016/s0022-328x(97)00108-3
日期:1997.8
Halogenated trisilanes XnSi3H8-n with X = Cl, Br, I and n = 2-7 as well as the tetrasilanes H2XSiSiX2SiX2SiX2H have been prepared by dearylation of appropriate aryltrisilanes and aryltetrasilanes (aryl = phenyl, p-tolyl) with either liquid or gaseous hydrogen halides. The compounds have been characterized with elemental analysis as well as Si-29 NMR spectroscopy. (C) 1997 Elsevier Science S.A.
Dehydrogenative polymerization of silanes to polysilanes by zirconocene and hafnocene catalysts. A new polymerization mechanism