<i>Z</i>-Selective Homodimerization of Terminal Olefins with a Ruthenium Metathesis Catalyst
作者:Benjamin K. Keitz、Koji Endo、Myles B. Herbert、Robert H. Grubbs
DOI:10.1021/ja203488e
日期:2011.6.29
The cross-metathesis of terminal olefins using a novel rutheniumcatalyst results in excellent selectivity for the Z-olefin homodimer. The reaction was found to tolerate a large number of functional groups, solvents, and temperatures while maintaining excellent Z-selectivity, even at high reaction conversions.
使用新型钌催化剂进行末端烯烃的交叉复分解,对 Z-烯烃均二聚体具有优异的选择性。研究发现,即使在高反应转化率下,该反应也能耐受大量官能团、溶剂和温度,同时保持优异的 Z 选择性。
A simple and practical phase-separation approach to the recycling of a homogeneous metathesis catalyst
作者:Anna Michrowska、Łukasz Gułajski、Karol Grela
DOI:10.1039/b517088e
日期:——
The air stable asarone-derived Ru carbene 16, a robust olefin metathesis catalyst, can be easily separated after reaction by deposition on silica gel and reused up to nine times. This procedure provides products of excellent purity with low Ru content.
New olefin metathesis catalyst bearing N-mesitylimidazole and nitrate ligands – Synthesis, activity, and performance in aqueous media
作者:Marta Malinowska、Mariana Kozlowska、Agnieszka Hryniewicka、Jacek W. Morzycki
DOI:10.1016/j.jorganchem.2019.06.018
日期:2019.9
activity in the model metathesis reactions. However, its activity increases upon the addition of an aqueous HCl 1 M solution. Activated Ru complex successfully promotes metathesis in organic solvents as well as in water, enabling efficient performance (even up to 100%) of the catalyst under environment-friendly conditions. The activation mechanism of the reported catalyst is supported by time-dependent
[EN] NEW PROCESS OF PREPARATION OF POLYOLS AND POLYAMINES, AND PRODUCTS AS OBTAINED<br/>[FR] NOUVEAU PROCÉDÉ DE PRÉPARATION DE POLYOLS ET DE POLYAMINES, ET PRODUITS OBTENUS
申请人:CENTRE NAT RECH SCIENT
公开号:WO2013072436A1
公开(公告)日:2013-05-23
The present invention relates to the use of a compound of formula (I) : wherein: - R represents –OH or –NH2;- A1 represents a divalent alkylene radical, straight or branched, having from 2 to 20 carbon atoms; - A2 represents a divalent alkylene radical, straight or branched, having from 1 to 20 carbon atoms; - X1 and X2 represent, independently of each other, –NH- or –O-;- A3 represents a divalent alkylene radical, straight or branched, having from 1 to 10 carbon atoms; - Z represents a hydrogen or a group of formula (A'): wherein A1, A3 and R are as defined above in formula (I), for the preparation of a polymer chosen among polyurethane, polyester and polyamide.
Theory-assisted development of a robust and Z-selective olefin metathesis catalyst
作者:Giovanni Occhipinti、Vitali Koudriavtsev、Karl W. Törnroos、Vidar R. Jensen
DOI:10.1039/c4dt00409d
日期:——
A tight interplay between theory and experiment has led to the development of a new, highly Z-selective ruthenium-based olefin metathesis catalyst that can be used in air, with unpurified and non-degassed substrates and solvents, and in the presence of acids.