Isoquinoline-catalyzed reaction between 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one and dialkyl acetylene dicarboxylates: synthesis of coumarin and pyranopyrane derivatives

In this work we report the reaction between dialkyl acetylenedicarboxylates and enolic systems such as 5,5-dimethyl-1,3-cyclohexanedione, 1,3-cyclohexanedione, 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one in the presence of isoquinoline, which leads to new coumarin and pyranopyran derivatives

Comparison of homo and copolymer of pyrrole and aniline electrosynthesized on ferric ion reduction

In this study, homo and copolymer of Aniline (Ani) and Pyrrole (Py) was electrosynthesized on composite graphite in acetic acid medium containing KCl as supporting electrolyte. The ability of electrosynthesized homo and copolymer on ferric ion reduction was compared and evaluated. The results show that the reduction properties of polyaniline (PAni) is greater than copolymer of aniline and pyrrole (Poly(Ani-co-Py)) and copolymer is more than polypyrrol (PPy). The FTIR and UV-visible spectra indicated that the increase of aniline monomer in the copolymer chain enhances the ferric ion reduction ability. Electrochemical Impedance Spectroscopy (EIS) was also used for further investigation. It was shown that the increase of aniline ring in the copolymer chain reduces the charge-transfer resistance and thus increases the reduction effect. The structure and morphology of homo and copolymer was confirmed by SEM, EDX and FTIR

ORIENTAL JOURNAL OF CHEMISTRY Zirconium Oxide Nanoparticles as an Efficient Catalyst for three-component Synthesis of Pyrazolo [1,2-a][1,2,4]triazole-1,3-diones Derivatives

AbSTRACT An efficient and green protocol for the synthesis of pyrazolo[1,2-a][1,2,4]triazole-1,3-diones derivatives by one pot, three component coupling reaction of aromatic aldehyde, malononitrile, and 4-phenylurazole has been developed using ZrO 2 nanoparticles (NPs) as the catalyst. The procedure is formed in high yields, short reaction time and an environmentally friendly specificity

A Facile Synthesis of Polysubstituted Pyrroles by One- Pot Three-Component Reaction

Abstract: A new and efficient one-pot synthesis of polysubstituted pyrrole derivatives by three-component reaction between dialkyl acetylenedicarboxylates, triphenylphosphine, 2-aminopyridin derivatives in the presence of arylglyoxals is described. The reactions were performed in dichloromethane at room temperature and neutral conditions and afforded high yields of products