Samarium-mediated redistribution of silanes and formation of trinuclear samarium–silicon clusters
摘要:
The samarium complex Cp(2)*SmCH(SiMe(3))(2) (Cp* = C(5)Me(5)), unlike the related alkyls Cp(2)*LnCH(SiMe(3))(2) (Ln = Y, Nd), mediates the redistribution of hydrosilanes while being converted to trisamarium clusters, including Cp(6)*Sm-3(mu-SiH3)(mu(3)-eta(1),eta(1),eta(2)-SiH2-SiH2).
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
Ruthenium(<scp>IV</scp>) silyl hydride complexes via reaction of silanes with 16-electron [Ru(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)(PPr<sup>i</sup><sub>3</sub>)X](X = Cl, CH<sub>2</sub>SiHPh<sub>2</sub>, SiMePh<sub>2</sub>) complexes. Hydride migrations to an η<sup>2</sup>-silene ligand
作者:Brian K. Campion、Richard H. Heyn、T. D. Tilley
DOI:10.1039/c39920001201
日期:——
Reactions of [Ru(η5-C5Me5)(PPri3)(H)(η2-CH2SiPh2)] with hydrosilanes occur via initial migration of hydride to the silene ligand, and eventually give disilyl hydride or silyl dihydride ruthenium(IV) complexes; the 16-electron chloride[Ru(η5-C5Me5)(PPri3)Cl] adds mesityl (Mes) silane to give [Ru(η5-C5Me5)(PPri3)(H)2(SiHcMes)] which was crystallographically characterized.
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.
Formation of Metal-coordinated Doubly Chelating Pentadentate Ligands by the Reactions of [MoH<sub>4</sub>(Ph<sub>2</sub>PCH<sub>2</sub>CH<sub>2</sub>PPh<sub>2</sub>)<sub>2</sub>] with Organohydrodisilanes
作者:Makoto Minato、Toshiki Nanami、Kenzi Kogoma、Takashi Ito
DOI:10.1246/cl.180472
日期:2018.9.5
Thermal reaction of [MoH4(dppe)2] (dppe = Ph2PCH2CH2PPh2) with RR′HSiSiHRR′ (R = Ph, Me, t-Bu; R′ = Me, H) occurs with formation of molybdenum silyl complexes, [MoH3Si(R)[Ph2PCH2CH2P(Ph)C6H4-o]2}], as a result of oxidative addition involving Si–H bond cleavage with concomitant selective activation of the ortho C–H bonds of the two dppe ligands.