Síntese e hidrólise de azalactonas de Erlenmeyer-Plöchl mediadas por radiação micro-ondas em aparelhos doméstico e dedicado: experimentos de química orgânica para a graduação
In: Química Nova, Jg. 36 (2013), Heft 1, S. 190-194
Online
academicJournal
Zugriff:
This work describes a green chemistry experiment for the synthesis of Erlenmeyer-Plöchl azalactones mediated by microwave irradiation, employing both dedicated and domestic equipment. Hippuric acid was reacted with equimolar amounts of benzaldehyde, p-chloro-benzaldehyde or p-N,N-dimethyl-benzaldehyde in acetic anhydride as the solvent. Acid hydrolysis of obtained 4-benzylidene-2-phenyloxazol-5(4H)-one under microwave and convectional heating afforded Z-α-(benzoylamino)cinnamic acid at a 51-61.5% yield. The UV-Vis molecular spectra of 4-benzylidene-2-phenyloxazol-5(4H)-one and 4-(4'-N,N-dimethylbenzylidene)-2-phenyloxazol-5(4H)-one were obtained in ethanol, CH2Cl2 and DMSO and bathochromic shift was observed for the latter azalactone.
Titel: |
Síntese e hidrólise de azalactonas de Erlenmeyer-Plöchl mediadas por radiação micro-ondas em aparelhos doméstico e dedicado: experimentos de química orgânica para a graduação
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Autor/in / Beteiligte Person: | Cunha, Silvio ; Raimundo Francisco dos Santos Filho ; Valéria Belli Riatto ; Glauber Antonio Albuquerque Dourado |
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Zeitschrift: | Química Nova, Jg. 36 (2013), Heft 1, S. 190-194 |
Veröffentlichung: | Sociedade Brasileira de Química, 2013 |
Medientyp: | academicJournal |
ISSN: | 1678-7064 (print) ; 0100-4042 (print) |
DOI: | 10.1590/S0100-40422013000100032 |
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