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

Autor:	Bowroju Suresh Kuarm, P. Someshwar, B. Rajitha, Yerram Reddy Thirupathi Reddy, Janganati Venu Madhav, Peter A. Crooks
Rok vydání:	2008
Předmět:	chemistry.chemical_compound Chemistry Elemental analysis Proton NMR Phenol Reactivity (chemistry) General Chemistry Phenols Pechmann condensation Carbon-13 NMR Catalysis Nuclear chemistry
Zdroj:	Journal of Chemical Research. 2008:232-234
ISSN:	2047-6507 1747-5198
DOI:	10.3184/030823408x313997
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 1H NMR, 13C NMR, MS, IR and elemental analysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5eee5ced8c465b078d550e45163b667f https://doi.org/10.3184/030823408x313997 Zobrazit plný text záznamu