Theoretical and spectroscopic studies of pyridyl substituted bis-coumarins and their new neodymium (III) complexes
摘要:
Ab initio, DFT and spectroscopic studies of 3,3 '-(o-pyridinomethylene)di-[4-hydroxycoumarin], 3,3 '-(m-pyridinomethylene)di-[4-hydroxycoumarin] and 3,3 '-(p-pyridinomethylene)di-[4-hydroxycoumarin] were performed. The molecular and electronic structures of the compounds were investigated using accurate HF and B3LYP/6-31G(d) calculations. Molecular quantities as vertical ionization potential, electron affinity, electronegativity, hardness and electrophilicity indices of the neutral species were calculated and discussed. Molecular electrostatic potential was considered as an additional molecular characteristic for predicting the most probable sites for electrophilic attack. The molecular structure and quantities of the dianionic species, which are active in solution, were calculated and discussed. The theoretical results suggested that both carbonyl and both hydroxyl oxygen atoms are preferred binding sites for electrophilic attack, in particular for a metal coordination. Further, the coordination abilities of the compounds were studied in complexation reactions with Nd(III). Complexes of Nd(III) with o-, m- and p-3,3 '-(pyridinomethylene)di-[4-hydroxycoumarin] were synthesized and characterized by different physicochemical methods: elemental analysis, IR, H-1 NMR spectroscopies and mass spectral data. The experimental data confirmed the theoretical predictions that the ligands in Nd(III) complexes are tetradentate and bound the metal ion through both carbonyl and both deprotonated hydroxyl oxygen atoms. (c) 2005 Elsevier B.V. All rights reserved.
DOI:
10.1016/j.chemphys.2005.01.026
作为产物:
描述:
4-吡啶甲醛 、 4-羟基香豆素 在
1,3-bis(carboxymethyl)-1H-benzo[d]imidazol-3-ium bromide coated on copper oxide nanoparticles 作用下,
以
neat (no solvent) 为溶剂,
反应 3.0h,
以93%的产率得到3,3'-(4-pyridylmethylene)-bis(4-hydroxy-2H-chromen-2-one)
The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs): an efficient, green and recyclable nanocatalyst for the synthesis of biscoumarin derivatives under solvent-free conditions
The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs) as a novel magnetic nanocatalyst was synthesized and fully characterized. The excellent catalytic activity of HAP/Fe3O4 NPs was investigated in the synthesis of biscoumarin derivatives under mild, green and solvent-freeconditions. A series of aromatic (bearing different functional groups), heteroaromatic and aliphatic aldehydes have
摘要合成并充分表征了 磁性纳米结构天然羟基磷灰石(HAP / Fe 3 O 4 NPs)。HAP / Fe 3 O 4的优异催化活性在温和,绿色和无溶剂条件下合成双香豆素衍生物中研究了NP。一系列芳香族(具有不同的官能团),杂芳香族和脂肪族醛已被转化为双香豆素,具有良好的分离产率。本方法与绿色化学原理非常吻合的显着优点是:催化剂便宜,无毒,易于处理且可重复使用多达六次循环,纳米结构催化剂的磁分离,后处理简单,反应时间短,产品的高收率和使用无溶剂条件。 图形概要
Trityl bromide versus nano-magnetic catalyst in the synthesis of henna-based xanthenes and bis-coumarins
作者:Mahmoud Zarei、Mohammad Ali Zolfigol、Ahmad Reza Moosavi-Zare、Ehsan Noroozizadeh
DOI:10.1007/s13738-017-1155-4
日期:2017.10
trityl bromide (TrBr) as a new, efficient, mild and neutral catalyst was used for the synthesis of henna-based xanthenes (aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraones) and bis-coumarins by in situ generation of trityl carbocation undersolvent-freeconditions in comparison with [Fe3O4@SiO2@(CH2)3-Im-SO3H]Cl as an acidic and reusablecatalyst for the first time. Graphical Abstract
BiVO4-NPs: an efficient nano-catalyst for the synthesis of biscoumarins, bis(indolyl)methanes and 3,4-dihydropyrimidin-2(1H)-ones (thiones) derivatives
作者:Farhad Shirini、Monireh Pourghasemi Lati
DOI:10.1007/s13738-016-0959-y
日期:2017.1
4-dihydropyrimidin-2(1H)-ones (thiones) derivatives. The structures of the products were characterized by IR, 1HNMR and 13C NMR spectroscopy and comparison with the authentic samples. Easy work-up procedure, excellent yields, short reaction times and reusability of the catalyst are some advantages of this work. In addition, in this article and for the first time, the preparation of 3,4-dihydropyrimidin-2(1H)-ones
BiVO 4 -NPs可用作促进双香豆素,双(吲哚基)甲烷和3,4-二氢嘧啶-2(1 H)-ones(thiones)衍生物合成的有效且可重复使用的纳米催化剂。产物的结构通过IR,1 H NMR和13 C NMR光谱表征,并与真实样品进行比较。简便的后处理程序,优异的收率,较短的反应时间和催化剂的可重复使用性是这项工作的一些优势。另外,在本文中并且首次报道了从醛的被保护的衍生物包括肟,半咔唑酮和1,1-二乙酸酯制备3,4-二氢嘧啶-2(1 H)-酮和-硫酮的报道。
Heterogeneous
<scp>
SO
<sub>3</sub>
H
</scp>
@
<scp>
Fe
<sub>3</sub>
O
<sub>4</sub>
</scp>
magnetic nanocatalyst as an efficient and reusable medium for the synthesis of 3,3′‐(arylmethylene)‐bis‐(4‐hydroxycoumarin), bis‐(indolyl)‐methane, and 1,8‐dioxo‐octahydroxanthene derivatives
作者:Xiaobo Wu、Wan‐Xi Peng
DOI:10.1002/jccs.202000087
日期:2020.11
This work aimed to synthesize a new heterogeneous catalyst (SO3H@Fe3O4 magnetic nanoparticles) and the study of its catalytic behavior in synthesizing 3,3′‐(arylmethylene)‐bis‐(4‐hydroxycoumarin), bis‐(indolyl)‐methane, and 1,8‐dioxo‐octahydroxanthene derivatives. The characterization of obtained material has been performed by means of Fourier‐transform infrared spectroscopy, thermogravimetric analysis
这项工作旨在合成一种新的非均相催化剂(SO 3 H @ Fe 3 O 4磁性纳米粒子),并研究其在合成3,3'-(芳基亚甲基)-双-(4-羟基香豆素),双-(吲哚基)-甲烷和1,8-二氧代-八氢氧杂蒽衍生物。通过傅立叶变换红外光谱,热重分析,X射线衍射,振动样品磁力计和透射电子显微镜对获得的材料进行表征。与以前的方法相比,这种新方法的主要特性是反应时间短,反应条件温和,通过永久磁场简单回收催化剂,具有出色的收率,并且催化剂可重复使用至少六次。
Sulfonated rice husk ash (RHA-SO3H) as a highly efficient and reusable catalyst for the synthesis of some bis-heterocyclic compounds
Sulfonated rice husk ash (RHA-SO3H), a newly reported solid acid catalyst, was efficiently used for the synthesis of 4,4′-(arylmethylene)-bis-(3-methyl-1-phenyl-1H-pyrazol-5-ols), 3,3′-(arylmethylene)-bis-(4-hydroxycoumarins) and bis(indolyl)methanes. The procedure gave the products in excellent yields within very short reaction times under mild and green conditions. Also this catalyst can be reused several times without appreciable loss of its catalytic activity.