3,3'-((4-chlorophenyl)methylene)bis(4-hydroxy-2H-chromen-2-one);3,3'-(4-chlorobenzylidene)-bis(4-hydroxycoumarin);3,3’-((4-chlorophenyl)methylene)bis(4-hydroxy-2H-chromen-2-one);3-((4-chlorophenyl)(4-hydroxy-2-oxo-2H-chromen-3-yl)methyl)-4-hydroxy-2H-chromen-2-one;3,3′-((4-chlorophenyl)methylene)bis(4-hydroxy-2H-chromen-2-one);3,3’-((4-chlorophenyl) methylene) bis (4-hydroxy-2H-chromene-2-one);COUMARIN, 3,3'-(p-CHLOROBENZYLIDENE)BIS(4-HYDROXY-;3-[(4-chlorophenyl)-(4-hydroxy-2-oxochromen-3-yl)methyl]-4-hydroxychromen-2-one
Simple protic ionic liquid [Et3NH][HSO4] as a proficient catalyst for facile synthesis of biscoumarins
作者:Sandip K. Patil、Deepak V. Awale、Madagonda M. Vadiyar、Suryakant A. Patil、Sagar C. Bhise、Sanjay S. Kolekar
DOI:10.1007/s11164-017-2932-5
日期:2017.10
Abstract We have explored a number of protic ionicliquids (PILs) as a catalyst for the synthesis of biscoumarins by condensation of 4-hydroxycoumarin with an aromatic aldehyde. Methylimidazolium- and triethylammonium-based PILs were synthesized by simple neutralization reaction with protic acids. Triethylammoniumhydrogensulfate [Et3NH][HSO4] was found to be the best among the studied PILs concerning
A Convenient, Eco-friendly, and Efficient Method for Synthesis of 3,3'-Arylmethylene-bis-4-hydroxycoumarins "On-water"
作者:Arpita Das Gupta、Swati Samanta、Rina Mondal、Asok K. Mallik
DOI:10.5012/bkcs.2012.33.12.4239
日期:2012.12.20
various aldehydes (aromatic, heterocyclic, and α,β-unsaturated) 2 using different catalysts and media. Some of these methods require long reaction time, use of expensive catalysts and organic solvents and tedious work up. In four recent papers, the said condensation has been reported to be performed in water by employing molecular iodine, ruthenium(III) chloride hydrate or surfactants like TBAB or DDS
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
V
<sub>2</sub>
O
<sub>5</sub>
based quadruple nano‐perovskite as a new catalyst for the synthesis of bis and tetrakis heterocyclic compounds
作者:Tamer K. Khatab、Amr Mohamed Abdelghany、Hanan A. Soliman
DOI:10.1002/aoc.4783
日期:2019.5
In this article, we presented a novel, efficient and facile approach for using strontium titanate supported catalyst in organic synthesis. Bis and tetrakis of coumarin, indole and xanthene derivatives can effortlessly have prepared using V2O5/perovskite nanoparticles (NPs) under solvent‐free condition. V2O5/perovskite in (NPs) was prepared and identified using Fourier transform infrared spectroscopy
在本文中,我们提出了一种新颖,高效且简便的方法,用于在有机合成中使用钛酸锶负载型催化剂。使用V 2 O 5 /钙钛矿纳米颗粒(NPs)在无溶剂条件下可以轻松制备香豆素,吲哚和and吨衍生物的二元和四元化合物。V 2 O 5使用傅里叶变换红外光谱(FTIR),X射线衍射(XRD)和支持能量色散X射线的扫描电子显微镜(SEM / EDAX)制备和鉴定/钙钛矿(NPs)。由强XRD峰计算得出的晶体尺寸与透射电子显微镜研究结果相符,在50-60 nm之间。EDAX分析和作图图像揭示了合成催化剂中所有成分的均匀分布及其计算的比率。