Sabou R,Hoelderich W F,Ramprasad D, et al.Synthesis of 7-hydroxy-4-methylcoumarin via the Pechmann reaction with Amberlyst ion-exchange resins as catalysts. Journal of Catalysis . 2005R. Sabou W.F. Hoelderich D. Ramprasad and R. Weinand.Synthesis of 7-hydroxy-4-methylcoumarin via the ...
Applications and Mode of Action[M]. Wiley & Sons: Chichester, 1997: 1-3. 3 4 7 第5 期 郑文兵等: 天然有机酸催化Pechmann 缩合反应合成香豆素衍生物的研究 表6 草酸催化Pechmann 缩合反应合成香豆素衍生物 Tab. 6 Oxalic acid catalyzed synthesis of coumarin derivatives via Pechmann condensation [2]...
2.Topics discussed in this article includes synthesis and structures of R2M2(CO)4, the reactions of its metal-metal triple bond with various reagents (such as nucleophiles, carbon-carbon mu.本文对一类重要的ⅥB族金属叁键化合物R_2M_2(CO)_4(R为环戊二烯基及类环戊二烯基)近年来的研究成果进行...
Please help me with the second part of the mechanism. I got the first part but I'm not sure how to get to the product. Here is the link to the reaction http://themerckindex.cambridgesoft.com/TheMerckIndex/NameReactions/ONR295.htm Thanks JN...
The indium(III) chloride-catalyzed von Pechmann reaction: a simple and effective procedure for the synthesis of 4-substituted coumarins Indium(III) chloride is used as an efficient catalyst in the von Pechmann condensation of phenols with β-ketoesters leading to the formation of coumarin d... ...
7-Hydroxy 4-methyl coumarinMicrowave assisted coumarin synthesisThe nano-crystalline sulfated-zirconia catalysts, prepared by one-step as well as two-step sol鈥揼el technique, showed excellent catalytic activity with a high substrate to catalyst weight ratio for the synthesis of 7-substituted 4-...
The strength and number of acid sites were determined by nonaqueous titration of n-butylamine in acetonitrile. Both Bronsted and Lewis acid sites were determined by FTIR spectra of pyridine adsorbed. Sulfated tin oxides were tested in the synthesis of 7-hydroxy-4-methyl coumarin via solvent free...
7-Hydroxy 4-methyl coumarinPechmann condensationKineticsA novel zirconia-based catalyst, with high sulfur content (15% w/w) and preservation of the tetragonal phase of zirconia, was synthesized for the first time via a solution combustion synthesis approach. Such high sulfur content with preservation...