A Two-Component Alkyne Metathesis Catalyst System with an Improved Substrate Scope and Functional Group Tolerance: Development and Applications to Natural Product Synthesis
作者:Sebastian Schaubach、Konrad Gebauer、Felix Ungeheuer、Laura Hoffmeister、Marina K. Ilg、Conny Wirtz、Alois Fürstner
DOI:10.1002/chem.201601163
日期:2016.6.13
standard catalyst 1 largely failed to effect the critical macrocyclization, whereas the two‐component system was fully operative. A study directed toward the quinolizidine alkaloid lythrancepine I features yet another instructive example, in that a triyne substrate was metathesized with the help of 3/11 such that two of the triple bonds participated in ring closure, while the third one passed uncompromised
Synthesis of novel bifunctional organosilicon dendrons via platinum-catalyzed hydrosilylation
作者:Krzysztof Kuciński、Grzegorz Hreczycho
DOI:10.1016/j.ica.2017.02.029
日期:2017.5
Abstract The synthesis of novel bifunctionalorganosilicon dendrons has been successfully achieved. The synthetic route is based on sequential platinum-catalyzed hydrosilylation reactions, that efficiently leads to the corresponding carbosilane dendrons containing a wide range of functional groups, such as –OSiMe 3 , –Cl, –F and –COOCR. Finally, the core of these dendrons comprises reactive alkoxy
Hydrosilylation Reaction Catalysts and Curable Compositions and Methods for Their Preparation and Use
申请人:Dow Corning Corporation
公开号:US20140296468A1
公开(公告)日:2014-10-02
A composition contains (A) a hydrosilylation reaction catalyst and (B) an aliphatically unsaturated compound having an average, per molecule, of one or more aliphatically unsaturated organic groups capable of undergoing hydrosilylation reaction. The composition is capable of reacting via hydrosilylation reaction to form a reaction product, such as a silane, a gum, a gel, a rubber, or a resin. Ingredient (A) contains an iron-organosilicon ligand complex that can be prepared by reacting an iron carbonyl compound and an organosilicon ligand.
Synthesis and structure of well-defined tricarbonyl iron(0) complexes with multivinylsilicon ligands
作者:Agnieszka Kownacka、Ireneusz Kownacki、Maciej Kubicki、Bogdan Marciniec、Richard Taylor
DOI:10.1016/j.jorganchem.2013.11.007
日期:2014.1
In this paper the synthesis of new iron(0) carbonyl complexes with π-bonded ligands containing at least two silicon-vinyl groups of formula [Fe(CO)3L] and [Fe(CO)3}2L′] are described. The synthesis is done via UV light initiated substitution of carbonyl ligands in [Fe(CO)5] or [Fe2(CO)9] precursors by organosilicon dienes, trienes, vinyl functional silicones (L), tetraenes (L′). The spectroscopic
在本文中,新的具有π键配体的新的铁(0)羰基配合物的合成为至少两个分子式为[Fe(CO)3 L]和[Fe(CO)3 } 2 L']的硅乙烯基基团。描述。合成完成后通过在的[Fe(CO)羰基配位体的UV光引发取代5 ]或[铁2(CO)9 ]由有机硅二烯,三烯,乙烯基官能化的硅氧烷(L),四烯(L')的前体。这些新颖的配合物的光谱研究(1 H和13 C NMR)和X射线分析表明,它们都是5个坐标,均表现出两个几何环境,即三角双锥体或四角锥体。
Silicone networks prepared via a living percolation mechanism: postgelation structure for networks with a variety of junction functionalities
作者:Pao Sun Chang、Mark A. Buese
DOI:10.1021/ja00077a052
日期:1993.12
octamethylcyclotetrasiloxane and an oligocyclosiloxane. The polymerization occurred by the random exchange of all siloxane bonds in the sol and the gel. Network where the junctions were tri-, tetra-, penta-, hexa-, hepta-, or octafunctional were prepared. The final structure was modeled by a simple thermodynamic consideration of the ring-chain equilibrium involved. The sol was primarily composed of cyclic