simple, efficient, and environmentally benign route was developed for the preparation of 14-aryl or alkyl-14H-dibenzo[a,j]xanthene, 1,8-dioxo-octahydroxanthene and 12-aryl—8,9,10,12-tetrahydrobenzo[a]xanthene-11-ones from condensation of various aldehydes with (i) β-naphthol, (ii) cyclic 1,3-dicarbonyl compounds and (iii) β-naphthol and cyclic 1,3-dicarbonyl compounds, using novel polymeric catalyst [poly(AMPS-co-AA)]
Rapid, efficient and solvent-free synthesis of (un)symmetrical xanthenes catalyzed by recyclable sulfated polyborate
作者:Manisha S. Patil、Amey V. Palav、Chetan K. Khatri、Ganesh U. Chaturbhuj
DOI:10.1016/j.tetlet.2017.06.027
日期:2017.7
straightforward approach to the synthesis of 1,8-dioxo-octahydroxanthenes, 14-phenyl-14H-dibenzo[a,j]xanthene and tetrahydrobenzoxanthene-11-ones under solvent-free conditions usingsulfated polyborate as a highly efficientcatalyst. The procedure offers several advantages including cleaner reaction profile, mild reaction condition, economic, recyclable and environmentally benign catalyst, high yields, simple
Introduction of a new ionic liquid solid acid based on clay as an efficient, recyclable and thermally stable catalyst for organic transformations
作者:Somayyeh Sarvi Beigbaghlou、Katayoun Marjani、Azizollah Habibi、Seyyed Vahid Atghia
DOI:10.1039/c5ra25297k
日期:——
Ammonium hydrogensulfate based ionic liquid immobilized on Na+–montmorillonite (AHS@MMT) was prepared via anchoring ammonium hydrogensulfate propyltriethoxysilane onto sodium montmorillonite by covalent bonds. The synthesized catalyst was full characterized by FT-IR, SEM, TGA and XRD techniques and Hammett acidity test and the catalytic activity of this novel catalyst was evaluated for the synthesis
Introduction of a new bi-SO<sub>3</sub>H ionic liquid based on 2,2′-bipyridine as a novel catalyst for the synthesis of various xanthene derivatives
作者:Farhad Shirini、Masoumeh Abedini、Mohaddeseh Seddighi、Omid Goli Jolodar、Mohadeseh Safarpoor、Nikoo Langroodi、Solmaz Zamani
DOI:10.1039/c4ra12361a
日期:——
1′-disulfo-[2,2′-bipyridine]-1,1′-diium chloride, [BiPy](SO3H)2Cl2 as a new ionic liquid, is prepared, characterized and used as an efficient catalyst for the promotion of the synthesis of various symmetric and asymmetric xanthene derivatives under solvent free conditions. All products were formed in excellent yields over short reaction times. Easy preparation of the catalyst, simple and easy work-up, mild
New nano-Fe<sub>3</sub>O<sub>4</sub>-supported Lewis acidic ionic liquid as a highly effective and recyclable catalyst for the preparation of benzoxanthenes and pyrroles under solvent-free sonication
magnetic nanomaterial-immobilized Lewisacidic ionic liquid was successfully synthesized by the covalent embedding of 3-(3-(trimethoxysilyl)propyl)-1H-imidazol-3-ium chlorozincate (II) ionic liquid to the surface of Fe3O4 nanoparticles. The material was then characterized by FT-IR, SEM, TEM, TGA, ICP-OES, Raman, and EDS. Its performance as a new-generation Lewisacidic catalyst was also examined on the
将3-(3-(三甲氧基甲硅烷基)丙基)-1 H-咪唑-3-氯锌酸盐( II )离子液体共价嵌入Fe 3 O表面,成功合成了一种新型磁性纳米材料固定化Lewis酸性离子液体4纳米粒子。然后通过 FT-IR、SEM、TEM、TGA、ICP-OES、拉曼和 EDS 对材料进行表征。其作为新一代路易斯酸性催化剂的性能也在超声介导的苯并氧杂蒽和吡咯合成中进行了检验。完成后,通过外部磁铁简单地回收催化剂以进行多次重复使用,而不会显着降低催化性能。