H<sub>6</sub>P<sub>2</sub>W<sub>18</sub>O<sub>62</sub>/Nanoclinoptilolite as an efficient nanohybrid catalyst in the cyclotrimerization of aryl methyl ketones under solvent-free conditions
作者:R. Tayebee、M. Jarrahi
DOI:10.1039/c5ra01344e
日期:——
wide range of alkyl, aryl, and cyclic ketones. The nanocatalyst was prepared via immobilization of Wells–Dawson heteropolyacid H6P2W18O62 (HPA) on the surface of nanoclinoptilolite (NCP). The nanohybrid material was easily recovered and reused successfully at least seven times without significant loss of catalytic activity. XRD, SEM, UV-Vis, MS-ICP, DTA, and FT-IR studies confirmed that the heteropolyacid
制备了一种新型的纳米杂化材料H 6 P 2 W 18 O 62 /纳米斜发沸石,并作为一种高效且可重复使用的催化剂,在不同的苯乙酮的温和单锅缩合反应中使用。本方法学的操作简便,易于后处理,具有成本效益和无溶剂的性质,可从多种烷基,芳基和环状物中得到所需的1,3,5-三芳基苯酮。通过固定Wells-Dawson杂多酸H 6 P 2 W 18 O 62制备纳米催化剂(HPA)在纳米斜发沸石(NCP)的表面上。纳米混合材料易于回收并成功重复使用至少七次,而催化活性没有明显损失。XRD,SEM,UV-Vis,MS-ICP,DTA和FT-IR研究证实,杂多酸很好地分散在NCP的表面上。开发的该方案是一种利用生态友好且高度可重复使用的天然纳米催化剂合成1,3,5-三芳基苯的安全便捷的替代方法。此外,水是唯一的副产物,这使得本方法学对环境无害。
A new method for the preparation of 1,3,5-triarylbenzenes catalyzed by nanoclinoptilolite/HDTMA
作者:R. Tayebee、M. Jarrahi、B. Maleki、M. Kargar Razi、Z. B. Mokhtari、S. M. Baghbanian
DOI:10.1039/c4ra11216d
日期:——
An efficient method for the preparation of 1,3,5-triarylbenzenes. Natural surface-modified NCP as a new and reusable catalyst. Using solvent-free conditions.
Triple self-condensation of ketones was promoted by titanium tetrachloride in toluene to afford corresponding benzene derivatives, and the structure of tri(2-naphthyl)benzene was confirmed by X-ray single crystal diffraction.
Rhodium-catalyzed direct aldol condensation of ketones: a facile synthesis of fused aromatic compounds
作者:Hiroki Terai、Hikaru Takaya、Takeshi Naota
DOI:10.1016/j.tetlet.2006.01.041
日期:2006.3
Cationic rhodium complex [Cp∗Rh(η6-C6H6)](BF4)2 (1) acts as an efficient catalyst for direct aldol condensation of ketones. The method can be applied to one-pot synthesis of fused aromatic compounds from cyclic ketones via sequential C–C bond formations.
阳离子铑络合物的[Cp *的Rh(η 6 -C 6 H ^ 6)](BF 4)2(1)充当酮的直接醛醇缩合的有效催化剂。该方法可用于通过连续的C–C键形成从一环酮一锅合成稠合的芳香族化合物。
Novel Synthesis of Fully-Substituted Pyridine Derivatives via Self-Condensation of Cyclic Ketones in Aqueous Ammonium Chloride under Hydrothermal Conditions
作者:Hiyoshizo Kotsuki、Barun K. Mehta、Kazumichi Yanagisawa
DOI:10.1055/s-2001-16065
日期:——
A new method for synthesizing fully-substituted pyridine derivatives was developed using the self-condensation of cyclic ketones in aqueous ammonium chloride under hydrothermal conditions.