Synthesis and Characterization of Scandium Silyl Complexes of the Type Cp*<sub>2</sub>ScSiHRR‘. σ-Bond Metathesis Reactions and Catalytic Dehydrogenative Silation of Hydrocarbons
作者:Aaron D. Sadow、T. Don Tilley
DOI:10.1021/ja040141r
日期:2005.1.1
The scandium dihydrosilyl complexes Cp*(2)ScSiH(2)R (R = Mes (4), Trip (5), SiPh(3) (6), Si(SiMe(3))(3) (7); Mes = 2,4,6-Me(3)C(6)H(2), Trip = 2,4,6-(i)()Pr(3)C(6)H(2)) and Cp*(2)ScSiH(SiMe(3))(2) (8) were synthesized by addition of the appropriate hydrosilane to Cp*(2)ScMe (1). Studies of these complexes in the context of hydrocarbon activation led to discovery of catalytic processes for the dehydrogenative
Synthesis and Reactivity of Silyl and Silylene Ligands in the Coordination Sphere of the 14-Electron Fragment Cp*(<sup>i</sup>Pr<sub>3</sub>P)Os<sup>+</sup>
作者:Paul B. Glaser、T. Don Tilley
DOI:10.1021/om040062o
日期:2004.11.1
Oxidative addition reactions of the 16-electron half-sandwich osmiumcomplex Cp*(iPr3P)OsBr (2) with SiH4 and primary and secondary hydrosilanes were examined. Compared to the previously studied rutheniumcomplex Cp(iPr3P)RuCl (1), 2 exhibits a greater tendency to add hydrosilanes to afford stable, isolable silyl complexes. Using an abstraction−migration methodology, in which abstraction of a labile
检查了16电子半三明治-络合物Cp *(i Pr 3 P)OsBr(2)与SiH 4以及伯氢硅烷和仲氢硅烷的氧化加成反应。与先前研究的钌配合物Cp(i Pr 3 P)RuCl(1)相比,2具有更大的添加氢硅烷的趋势,从而提供稳定的,可分离的甲硅烷基配合物。使用抽象迁移方法,其中先提取不稳定的金属卤化物配体,然后从硅向金属中心进行1,2-H迁移,然后制备了新的sil甲硅烷基络合物。因此,将2衍生的甲硅烷基络合物与LiB(C 6F 5)4得到[Cp *(i Pr 3 P)(H)2 Os SiRR'] [B(C 6 F 5)4 ]类型的阳离子甲硅烷基络合物(R =芳基,甲硅烷基; R'=芳基,H)。甲硅烷基络合物的低场29 Si化学位移范围为316 ppm(R = 2,4,6- i Pr 3 C 6 H 2,R'= H; 18)至417 ppm(R = Si(SiMe 3)3, R'= H; 1
Gauging the Steric Effects of Silyl Groups with a Molecular Balance
作者:Henrik F. König、Lars Rummel、Heike Hausmann、Jonathan Becker、Jan M. Schümann、Peter R. Schreiner
DOI:10.1021/acs.joc.1c03103
日期:2022.4.1
balance disubstituted with commonly used silyl groups. Such groups often serve as protecting groups and are typically considered innocent bystanders. Our motivation here is to determine the actual steric effects of such groups by employing a molecular balance. While in the unfolded 1,4-valence isomer the silyl groups are far apart (dσ–σ ≥ 5.15 Å), the folded 1,6-isomer is affected greatly by noncovalent
Cp*(PiPr<sub>3</sub>)RuOTf: A Reagent for Access to Ruthenium Silylene Complexes
作者:Meg E. Fasulo、Paul B. Glaser、T. Don Tilley
DOI:10.1021/om200795x
日期:2011.10.24
The ruthenium triflate complex Cp*(PiPr(3))RuOTf (1) was generated from the reaction of Cp*(PiPr(3))RuCl with Me3SiOTf in dibutyl ether. Complex 1 reacted with primary and secondary silanes to produce a family of Ru(IV) silyl dihydride complexes of the type Cp*(PiPr(3))Ru(H)(2)(SiRR'OTf) (3-12). Structural analyses of complexes 8 (R = R' = Ph) and 12 (R = R' = fluorenyl) revealed the presence of a tetrahedral silicon center and a four-legged piano stool geometry about ruthenium. Anion abstraction from Cp*(PiPr(3))Ru(H)(2)(SiHROTf) by [Et3Si center dot toluene][B(C6F5)(4)] afforded hydrogen-substituted cationic ruthenium silylene complexes [Cp*(PiPr(3))Ru(H)(2)(=SiHR)][B(C6F5)(4)] (R = Mes (13), R = Si(SiMe3) (14)) that display a significant Ru-H center dot center dot center dot Si interaction, as indicated by relatively large (2)J(SiH) coupling constants ((2)J(SiH) = 58.2 Hz (13), (2)J(SiH) = 37.1 Hz (14)). The syntheses of secondary silylene complexes [Cp*(PiPr(3))Ru(H)(2)(=SiRR')][B(C6F5)(4)] (R = R' = Ph (15); R = Ph, R' = Me (16), R = R' = fluorenyl (17)) were also achieved by anion abstraction with [Et3Si center dot toluene] [B(C6F5)(4)]. Complexes 15-17 do not display strong Ru-H center dot center dot center dot Si secondary interactions, as indicated by very small (2)J(SiH) coupling constant values.
DEROUICHE, YOUCEF;LICKISS, PAUL D., J. OGANOMET. CHEM., 407,(1991) N, C. 41-49