Microwave‐associate synthesis of Co
<sub>3</sub>
O
<sub>4</sub>
nanoparticles as an effcient nanocatalyst for the synthesis of arylidene barbituric and Meldrum's acid derivatives in green media
作者:Mahdieh Yahyazadehfar、Enayatollah Sheikhhosseini、Sayed Ali Ahmadi、Dadkhoda Ghazanfari
DOI:10.1002/aoc.5100
日期:——
conditions using controlled, effective, and facile microwave method. The final nanostructures were characterized by SEM, XRD, and TEM analyses. The products had a small size distribution, homogeneous morphology, and crystallographic structures associated with the formation of Co3O4 nanostructures. Moreover, EDS mapping analysis confirmed the existence of Co and O elements in the final structure, and the
在这项研究中,使用可控,有效且简便的微波方法,在环境适宜的条件下构建了Co 3 O 4纳米催化剂。通过SEM,XRD和TEM分析来表征最终的纳米结构。产物具有较小的尺寸分布,均匀的形态和与Co 3 O 4形成相关的晶体结构纳米结构。此外,EDS作图分析证实了最终结构中存在Co和O元素,并通过VSM研究了样品的磁性。此纳米结构中的催化方法中的应用进一步检查,结果表明,它可作为一种新的候选为亚芳基巴比妥和麦德鲁姆的合成, s至由巴比妥和麦德鲁姆醛的Knoevenagel缩合酸, S酸性中水性介质。这些纳米催化剂的高产率将由纳米结构的性质以及本研究开发的实验程序来证明,这影响了产物的理化特性。
Verjuice as a green and bio-degradable solvent/catalyst for facile and eco-friendly synthesis of 5-arylmethylenepyrimidine-2,4,6-trione, pyrano[2,3-d]pyrimidinone and pyrimido[4,5-d]pyrimidinone derivatives
作者:Niloufar Safari、Farhad Shirini、Hassan Tajik
DOI:10.1007/s13738-018-1565-y
日期:2019.4
of the synthesis of 5-arylmethylenepyrimidine-2,4,6-triones, via Knovenagel condensation reaction between barbituric or thiobarbituric acid and aldehydes. Verjuice is also employed for the effective synthesis of pyrano[2,3-d]pyrimidinonederivatives via a three-component reaction of barbituric acid or its thio analogue, aldehydes and malononitrile. In the same way, pyrimido[4,5-d]pyrimidinone derivatives
Verjuice(未成熟的葡萄汁)是一种有机酸的天然混合物,可通过pH值和TGA分析鉴定,可通过Knovenagel缩合有效地用于促进5-芳基亚甲基嘧啶-2,4,6-三酮的合成。巴比妥酸或硫代巴比妥酸与醛之间的反应。Verjuice还用于通过巴比妥酸或其硫代类似物,醛和丙二腈的三组分反应有效合成吡喃并[2,3- d ]嘧啶酮衍生物。同样,嘧啶基[4,5- d]嘧啶酮衍生物可简单地通过巴比妥酸,醛与脲或硫脲在果汁中的反应来制备。这种绿色方法学具有显着的优势,包括操作简单,可接受的反应时间,易于后处理,高收率,避免在反应和后处理过程中使用任何昂贵的起始原料,挥发性和有害有机溶剂以及使用天然,低成本,可重复使用且可生物降解的催化剂。
DABCO-based ionic liquids: green and recyclable catalysts for the synthesis of barbituric and thiobarbituric acid derivatives in aqueous media
the reaction of barbituric or thiobarbituric acid, malononitrile and aldehydes in the presence of this reagent and 1,4-disulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium chloride ([DABCO](SO3H)2(Cl)2) has been investigated. The structure of the products was characterized using IR, 1H NMR and 13C NMR spectroscopy. The present methodologies suggests several advantages such as ease of the preparation and
一种新的,直接的方法,可通过使用1,4-二磺基-1,4-二氮杂双环[2.2.2]辛烷-1通过巴比妥酸及其硫代类似物与醛的反应来合成5-芳基巴比妥酸和硫代巴比妥酸,已经报道了作为有效催化剂的4-二硫酸氢二钠([DABCO](SO 3 H)2(HSO 4)2)。在该项目中,还通过在该试剂和1,4-二磺基-1,4-二氮杂双环[2.2]存在下,通过巴比妥酸或硫代巴比妥酸,丙二腈和醛的反应制备吡喃并[2,3- d ]-嘧啶二酮。 .2]辛烷-1,4-氯化铵([DABCO](SO 3 H)2(Cl)2)已被调查。使用IR,1 H NMR和13 C NMR光谱对产物的结构进行表征。本方法论提出了若干优点,例如易于制备和处理催化剂,高收率,简单和绿色的方法,低成本,短的反应时间,易于后处理和在水中作为绿色溶剂进行反应的预形成。
Succinimidinium hydrogensulfate ([H-Suc]HSO4) as an efficient ionic liquid catalyst for the synthesis of 5-arylidenepyrimidine-2,4,6(1H,3H,5H)-trione and pyrano-pyrimidinones derivatives
this work, succinimidinium hydrogensulfate ([H-Suc]HSO4), a newly reported Brönsted acidic ionic liquids is used as an efficient, homogeneous and reusable catalyst for the synthesis of 5-arylidenepyrimidine-2,4,6(1H,3H,5H)-trione and pyrano[2,3-d]-pyrimidine dione derivatives. The products were formed in excellent yields over short reaction times and the catalyst can be reused several times without
Succinimidinium N-sulfonic acid hydrogen sulfate as an efficient ionic liquid catalyst for the synthesis of 5-arylmethylene-pyrimidine-2,4,6-trione and pyrano[2,3-d]pyrimidinone derivatives
([SuSA-H]HSO4) as a new ionic liquid is prepared and characterized using a variety of techniques, including infrared spectra (FT-IR), 1H and 13C NMR, scanning electron microscopy, a massspectra method, as well as by Hammett acidity function. The prepared reagent is efficiently able to catalyze the preparation of 5-arylmethylene-pyrimidine-2,4,6-triones via the condensation of aldehydes and barbituric acid
使用多种技术制备并表征了琥珀酰亚胺 N- 磺酸硫酸氢盐([SuSA-H] HSO 4),并使用多种技术进行了表征,包括红外光谱(FT-IR),1 H和13 C NMR,扫描电子显微镜,质谱方法以及Hammett酸度函数。通过醛和巴比妥酸的缩合,所制备的试剂能够有效地催化5-芳基亚甲基-嘧啶-2,4,6-三酮的制备。进一步的研究表明,醛与巴比妥酸和丙二腈的缩合反应生成吡喃并[2,3- d 在该试剂的存在下,也可以有效地促进]嘧啶酮衍生物。本发明的方法具有几个优点,包括易于制备和处理催化剂,简单和容易的后处理,短的反应时间,产物的高产率和催化剂的可回收性。