Epoxidation of Alkenes Under Liquid-Liquid Biphasic Conditions: Synthesis and Catalytic Activity of Mn(III)-Tetraarylporphyrins Bearing Perfluoroalkyl Tails.
摘要:
Four tetraarylporphyrins bearing one n-C8F17 chain on each meso-aryl group have been synthesized. The Mn(III)-complexes of these new compounds (Mn-1 - Mn-4) were used as catalysts in alkene epoxidations carried out under aqueous-organic biphasic conditions. High epoxide yields were obtained with catalysts in which, along with perfluoroalkyl chains, bulky substituents were present at appropriate positions. The expected general enhancement of stability and catalytic activity due to the electron-withdrawing effect of n-C8F17 substituents was not observed. However, Mn-4 was found to be an exceptionally active catalyst for NaOCl promoted epoxidation of poorly reactive linear alpha-alkenes. (C) 1997 Elsevier Science Ltd.
Azobenzene-Based Organic Salts with Ionic Liquid and Liquid Crystalline Properties
作者:Kathrin Stappert、Johanna Muthmann、Eike T. Spielberg、Anja-Verena Mudring
DOI:10.1021/acs.cgd.5b01024
日期:2015.9.2
carbon atoms on they form a smectic A liquid crystalline phase. The representatives of the third set with a O–C6 bridge qualify as ionicliquids with melting points less than 100 °C. However, only the representative with a hexadecyl chain forms a liquid crystalline phase. Representative single crystals for all sets of cations could be grown that allowed for single crystal structure analysis. Together
Investigation on the Coordination Mode of IL-Supported Diols Used as Phosphine-Free Ligands for Palladium Catalyzed Heck Reaction
作者:Yueqin Cai、Gonghua Song、Xiao Chen
DOI:10.1002/cjoc.201300461
日期:2013.10
The coordinationmode of IL‐supported diolsused as phosphine‐free ligands for palladiumcatalyzedHeckreaction has been investigated by tuning their compositions. The difference in coordination of these IL‐supported diols with metal Pd in Heckreaction was related to the changes of the cation rings, leading to the different activities of Pd catalyst in the reaction. The experimental results indicated
Preparation and Characterization of New Phosphonyl-Substituted Imidazolium Ionic Liquids
作者:Zong-gang Mu、Feng Zhou、Shu-xiang Zhang、Yong-min Liang、Wei-min Liu
DOI:10.1002/hlca.200490227
日期:2004.10
A new series of diethoxyphosphinyl-substituted imidazolium ‘room-temperature ionicliquids’ (RTILs) were synthesized and characterized. The new compounds 1–12 (Table 1) were shown to have similar densities, but higher viscosities, than common ionicliquids. The new materials remain liquid over a broad temperature range, possess extremely low vapor pressures, display relatively high thermal stabilities