Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1410424 | Journal of Molecular Structure | 2009 | 7 Pages |
Abstract
IR spectroscopy in cryogenic argon matrix of methyl 4-chloro-5-phenyl-1,3-oxazole-2-carboxylate and methyl 4-chloro-5-phenylisoxazole-3-carboxylate was applied for the structural assignment of these isomeric heterocycles. It was demonstrated that methyl 2-benzoyl-2-halo-2H-azirine-3-carboxylates undergo thermal ring expansion to give 4-halo-5-phenyl-1,3-oxazole-2-carboxylates and not the isomeric isoxazoles.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Susy Lopes, Cláudio M. Nunes, Rui Fausto, Teresa M.V.D. Pinho e Melo,