Photopolymerizable diepoxides containing a nitrogen heterocycle
申请人:Ciba-Geigy Corporation
公开号:US04124760A1
公开(公告)日:1978-11-07
Diepoxides which may be photopolymerized in the presence or absence of a photosensitizer contain a group having conjugated unsaturation attached to a nitrogen heterocycle, such as a hydantoin or barbituric acid residue, forming part of an advanced diepoxide. The resultant photopolymer may be crosslinked by heating in the presence of a curing agent for epoxide resins. The diepoxides are of use in the production of printing plates and printed circuits, especially multilayer printed circuits.
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。
Knoevenagel condensation in aqueous media promoted by 2,2′-bipyridinium dihydrogen phosphate as a green efficient catalyst
ionic compound named 2,2′-bipyridinium dihydrogen phosphate was synthesized by addition of phosphoric acid to a solution of 2,2′-Bipyridine in dichloromethane. After the characterization using FT-IR, mass, 1H, 13C and 31P NMR techniques, it was used as a Bronsted dicationic acidic catalyst for the promotion of the synthesis of 2-arylidene malononitrile and 5-arylidene barbituric acidderivatives via
通过将磷酸添加到2,2'-联吡啶在二氯甲烷中的溶液中,合成了名为2,2'-联吡啶二磷酸二氢的基于2,2'-联吡啶的离子化合物。在使用FT-IR,质谱,1 H,13 C和31 P NMR技术进行表征后,将其用作布朗斯台克双阳离子酸性催化剂,以促进通过Knoevenagel合成2芳基丙二腈和5芳基巴比妥酸衍生物。在水中发生缩合反应。该方法的一些优点是在高反应速率和产率下利用容易制备的,成本有效的和生态友好的有机盐作为催化剂,简单和快速的后处理以及可接受的催化剂可重复使用性。
Functionalization of Cinnamaldehyde to Arylidene Barbituric Acid Catalyzed by Samarium(III) Chloride
Benzaldehyde and cinnamaldehyde were successfully condensed with barbituric acid using samarium(III) chloride in water for 2 h at room temperature. The products were confirmed through FTIR, UV-Vis and GC-MS analysis.
Mono C-alkylation and mono C-benzylation of barbituric acids through zinc/acid reduction of acyl, benzylidene, and alkylidene barbiturate intermediates
作者:Branko S. Jursic、Edwin D. Stevens
DOI:10.1016/s0040-4039(03)00111-4
日期:2003.3
Through systematic exploration of reaction conditions, very efficient preparative procedures for obtaining large quantities of substituted 5-alkyl and 5-benzylbarbituric acids were developed. The procedure involves a two step preparation in which the second step is zinc dust/acid reduction. For preparation of 5-alkylbarbiturates, the first step is the preparation of either 5-acyl or 5-alkylidenebarbiturate