A Novel Crown Ether Generation Containing Different Heteroaromatic Cations: Synthesis, Characterization, Solid-Phase <sup>13</sup>C NMR, X-ray Crystal Structure, and Selective Amino Acid Recognition
作者:Abolghasem Moghimi、Majid Faal Rastegar、Mehdi Ghandi、Masoud Taghizadeh、Abdollah Yari、Mojtaba Shamsipur、Glenn P. A. Yap、Hamid Rahbarnoohi
DOI:10.1021/jo010869f
日期:2002.4.1
The synthesis and structural characterization of a novel generation of crownethers, 3, 5 and 6 containing pyrilium, thiopyrilium, and pyridinium subunits, respectively, are reported. The crownether unit is potentially capable of forming host-guest complexes with inorganic and organic cations, while the heteroaromatic cationic unit is suitable to bind with anions. A variety of physicochemical methods
A comparative study of the stereochemistry of 4-acetyl-, formyl- and carboxy-benzo-9-crown-3 ether via X-ray crystallography and solid state and solution NMR spectroscopy
作者:G.W. Buchanan、M.F. Rastegar、G.P.A. Yap
DOI:10.1016/s0022-2860(00)00775-4
日期:2001.4
Abstract The X-ray crystal structures for the title molecules show remarkably similar geometries in the crown ether regions compared to benzo-9-crown-3 ether itself. Solid phase 13C NMR chemical shift differences of ca. 8.5 ppm are observed between the two aryl–O–C∗ carbons and are explained using results of ab initio calculations previously performed on anisole. Chemical shift assignments have been
摘要 标题分子的 X 射线晶体结构在冠醚区域显示出与苯并-9-冠-3 醚本身非常相似的几何形状。固相 13C NMR 化学位移差异约为 在两个芳基-O-C* 碳之间观察到 8.5 ppm,并使用先前对苯甲醚进行的 ab initio 计算结果进行解释。化学位移分配已通过使用选择性氘化衍生物进行了验证。
A novel crown ether generation containing the pyrilium heteroaromatic cation Synthesis, characterization, and solid-phase <sup>13</sup>C NMR
作者:Abolghasem Moghimi、Majid Faal Rastegar、Mehdi Ghandi
DOI:10.1139/v04-144
日期:2004.12.1
The synthesis and structural characterization of two members, 5 and 6, of a novel generation of crownetherscontaining the pyrilium cation are reported. These two compounds containtwo and three benzo-9-crown-3 (B9C3) units, respectively, connected to the 2 and 6 or 2, 4, and 6 positions of a central pyrilium cation. The crownethers 5 and 6 were obtained from the condensation reaction of appropriate
Catalytic cross-coupling reaction of aryl iodides with triarylbismuths by an N-heterocyclic carbene-PdCl2 based on benzo-9-crown-3 catalyst at room temperature
作者:Jia-Qi Liu、Jun-Juan Yang、Jun-Fei Li、Kai Li、Xue-Dong Xiao、Ya-Li Bai、Jun-Wen Wang
DOI:10.1016/j.mcat.2017.10.004
日期:2017.12
We have developed the N-heterocycliccarbene ligand/PdCl2 catalyst for CC coupling reaction of aryl iodides and organobismuths at room temperature. The established catalytic system exhibited high cross-coupling reactivity between a variety of orgnobismuths and aryl iodides in the presence of K2CO3 as base in NMP or DMSO at room temperature. The simple and efficient transformation can tolerate either
我们已经开发出用于在室温下芳基碘化物和有机铋的C C偶联反应的N杂环卡宾配体/ PdCl 2催化剂。所建立的催化体系在室温下在NMP或DMSO中存在以K 2 CO 3为碱的情况下,在各种正铋和芳基碘之间表现出较高的交叉偶联反应性。简单而有效的转化可以耐受吸电子或给电子官能团。值得注意的是,使用5mol%的PPh 3 /配体5(1∶1)作为催化剂,芳基溴化物和芳基氯均产生中等至良好产率的相应联苯产物。