The high-yielding synthesis of diphenolicacid (DPA) using Brønsted acidic ionic liquids (BAILs) has been demonstrated in this study. Importantly, p,p′-DPA was obtained as the preferential product over o,p′-DPA with an isomer ratio over 100. Moreover, diphenolic esters were also prepared in high yield through a one-pot method.
Highly efficient carbene and polycarbene catalysis of the transesterification reaction
作者:Konstantin A. Marichev、Nikolai I. Korotkikh、Alan H. Cowley、Vagiz Sh. Saberov、Nataliya V. Glinyanaya、Gennady F. Rayenko、Oles P. Shvaika
DOI:10.24820/ark.5550190.p010.034
日期:——
Highlyefficientcarbene and polycarbenecatalysis of the transesterificationreaction of ethyl benzoate in methanol has been observed and results in values of TON as high as 4000–6150 at a molar ratio of ester to methanol of 1:18 at room temperature. The most effective catalysts were found to be the individual carbenes or in situ generated carbenes, namely adamantyl and aromatic substituted cyclic
Two novel binuclear sulfonic-functionalized ionic liquids: Influence of anion and carbon-spacer on catalytic efficiency for one-pot synthesis of bis(indolyl)methanes
from pyrazinium, piperazinium, benzimidazolium, imidazolium mono- or di-cation containing chloride and hydrogen sulfate as counter anion under optimized conditions. It was proved that the new ionic liquids containing two sulfonic imidazole moieties with four-carbon spacer as well as hydrogen sulfate as acidic counter anion were superior to the previously reported ionic liquids.
合成了两种新的具有四碳间隔基的双核磺酸官能化离子液体,并通过FTIR,MS,1 H和13对其结构进行了表征1 H NMR; 然后确定特定任务的新型离子液体水溶液的一些物理性质和pH值。研究了它们在温和条件下的双溶剂催化活性,以合成双(吲哚基)甲烷。在优化的条件下,将这些离子液体的催化活性与衍生自吡嗪鎓,哌嗪鎓,苯并咪唑鎓,咪唑鎓单或二阳离子的氯化物和硫酸氢盐作为抗衡阴离子的某些离子液体进行了比较。事实证明,含有两个带有四个碳间隔基的磺酸咪唑部分以及硫酸氢盐作为酸性抗衡阴离子的新型离子液体优于以前报道的离子液体。
PdEDTA Held in an Ionic Liquid Brush as a Highly Efficient and Reusable Catalyst for Suzuki Reactions in Water
An efficient and reusablecatalyst with PdEDTA immobilized in an ionicliquidbrush and a green procedure have been developed for coupling aryl iodides and bromides with phenylboronic acid. These reactions were conducted in water under aerobic conditions with water-insoluble or even solid aryl halides. The protocol has the advantages of excellent yields, environmental friendliness, and catalyst recyclability
Polycarboxylate anions effect on the structures of a series of transition metal-based coordination polymers: Syntheses, crystal structures and bioactivities
作者:Bing-Jun Zhang、Cui-Juan Wang、Guang-Mei Qiu、Shuai Huang、Xian-Li Zhou、Jie Weng、Yao-Yu Wang
DOI:10.1016/j.ica.2012.11.018
日期:2013.3
spectra, and X-ray diffraction, namely [Zn(bbi) 3 (NO 3 )]Br·2H 2 O} n ( 1 ), [Zn(oxa)(bbi)] n ( 2 ), [Mn(fma) 2 (bbi) 2 (H2 O) 2 ] n ( 3 ), [Cd 2 (bpdc) 2 (bbi) 2 ] n ( 4 ) and [Co 8 (cit) 4 (bbi) 6 (H2 O) 10 ]·7H 2 O} n ( 5 ). Compounds 1 – 5 display various coordination motifs due to different conformations of the bbi ligand, at the same time, owing to diverse coordination modes of the polycarboxylate