ChemInform Abstract: Dipyridine Cobalt Chloride: A Novel Catalyst for the Synthesis of Coumarins via Pechmann Condensation

Autor:	P. Someshwar, Yerram Reddy Thirupathi Reddy, Janganati Venu Madhav, Peter A. Crooks, B. Rajitha, Bowroju Suresh Kuarm
Rok vydání:	2008
Předmět:	chemistry.chemical_compound chemistry Elemental analysis Proton NMR Phenol Organic chemistry Reactivity (chemistry) General Medicine Phenols Pechmann condensation Carbon-13 NMR Catalysis
Zdroj:	ChemInform. 39
ISSN:	1522-2667 0931-7597
DOI:	10.1002/chin.200839122
Popis:	Dipyridine cobalt chloride is a novel catalyst for the Pechmann condensation involving different phenols and ethylacetoacetate under solvent-free conditions using both conventional methods and microwave irradiation. It gives the corresponding coumarins in excellent yields with high purity. The catalyst is thermally stable, inexpensive and recyclable. A faster reaction and higher yields compared to the conventional method and no side products were identified using microwave irradiation. In this reaction, electron releasing groups on the phenol ring shown more reactivity and gave high yields than simple phenol. These products were identified by 1 H NMR, 13 C NMR, MS, IR and elemental analysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ce0ecdd9dcef07150473d9c4dbd8c245 https://doi.org/10.1002/chin.200839122 Zobrazit plný text záznamu Plný text