3 -SiO 2 as an efficient and heterogeneous catalyst under microwave irradiation and thermal conditions. This method has the advantages of high yields, cleaner reactions, efficient and cost-effective method, simple methodology, short reaction times, easy workup, and greener conditions.
Applications of a novel nano magnetic catalyst in the synthesis of 1,8-dioxo-octahydroxanthene and dihydropyrano[2,3-c]pyrazole derivatives
作者:Mohammad Ali Zolfigol、Roya Ayazi-Nasrabadi、Saeed Baghery、Vahid Khakyzadeh、Saeid Azizian
DOI:10.1016/j.molcata.2016.03.027
日期:2016.7
nano-structured organo solid catalyst as a novel, mild and full-fledged catalyst was used for the cascade synthesis of 1,8-dioxo-octahydroxanthene derivatives by the condensation reaction between dimedone and various aldehydes at 80 °C under solvent-free conditions. Similarly, dihydropyrano[2,3-c]pyrazole derivatives were synthesized by the one-potthree-component condensation reaction of aldehydes, malononitrile
咪唑基离子液体在二氧化硅包覆的Fe 3 O 4磁性纳米颗粒上稳定[纳米Fe 3 O 4 @SiO 2 @(CH 2)3-咪唑-SO 3设计,合成并充分表征了作为新型多相酸性催化剂的H] Cl,并通过FT-IR,热重分析(TGA),差热分析(DTA),能量色散X射线能谱(EDX),X射线衍射进行了表征模式(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),原子力显微镜(AFM),布鲁瑙尔·埃米特·泰勒(BET)和电感耦合等离子体(ICP)分析。纳米结构的有机固体催化剂是一种新颖,温和而成熟的催化剂,它通过在无溶剂条件下,二甲酮与各种醛类在80°C下缩合反应,用于级联合成1,8-二氧-八氢氧杂蒽衍生物。 。同样,二氢吡喃[2,3- c在室温下无溶剂条件下,通过醛,丙二腈和3-甲基-1-苯基-2-吡唑啉-5-one的一锅三组分缩合反应合成]吡唑衍生物。据我们所知,这是合成[nano-Fe
Catalytic application of N,2-dibromo-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide as a new catalyst for the synthesis of 9-aryl-1,8-dioxo-octahydroxanthenes under neutral media
Abstract A new N-bromo sulfonamide reagent, namely N,2-dibromo-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide, was synthesized and used as a new and highly efficient catalyst for the preparation of 9-aryl-1,8-dioxo-octahydroxanthene derivatives by the condensation reaction of dimedone (5,5-dimethylcyclohexane-1,3-dione) and various arylaldehydes. Mechanistically, it is
Synthesis and characterization of a novel Brönsted acidic dicationic ionic liquid based on piperazine and its application in the one-pot synthesis of various xanthenes under solvent-free conditions
作者:Zainab Ehsani-Nasab、Ali Ezabadi
DOI:10.1007/s11164-022-04666-0
日期:2022.3
In this paper, an interesting Brönstedacidic dicationic ionicliquid based on piperazine was prepared via two-step synthesis. The structure of the dicationic ionicliquid (DIL) was confirmed with various techniques including Fourier transform infrared spectroscopy (FT-IR), Proton NMR (1H NMR), Carbon-13 NMR (13C NMR), mass spectroscopy (MS), acid–base titration as well as Hammett acidity function
在本文中,通过两步合成制备了一种有趣的基于哌嗪的 Brönsted 酸性双阳离子离子液体。双阳离子离子液体 (DIL) 的结构通过多种技术确认,包括傅里叶变换红外光谱 (FT-IR)、质子 NMR ( 1 H NMR)、Carbon-13 NMR ( 13 C NMR)、质谱 (MS)、酸碱滴定和哈米特酸度函数。在呫吨合成中检测了这种新型布朗斯台德酸性 DIL 的催化活性。产品收率高、反应时间短、催化剂易于回收和再利用以及不使用有机溶剂是开发过程的一些优点。
Solvent-free Synthesis of 1,8-Dioxo-octahydroxanthenes and Tetra-hydrobenzo[a]xanthene-11-ones over Poly(<i>N,N</i>′-dibromo-<i>N</i>-ethylnaphtyl-2,7-sulfonamide)
In this work, poly(N,N′‐dibromo‐N‐ethylnaphtyl‐2,7‐sulfonamide) (PDNES) as a highly efficient catalyst was applied for the synthesis of 1,8‐dioxo‐octahydroxanthenes and tetra‐hydrobenzo[a]xanthene‐11‐ones under neutral and solvent‐free conditions.