1. The preparation of thiazole-4- and -5-carboxylates, and an infrared study of their rotational isomers
- Author
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Stephen P. Breukelman, G. Denis Meakins, Perry T. Kaye, David J. Morgan, and Anne Barton
- Subjects
chemistry.chemical_classification ,chemistry.chemical_compound ,chemistry ,Computational chemistry ,Infrared ,Photochemistry ,Thiazole ,Conformational isomerism ,Alkyl - Abstract
Convenient general procedures have been developed for preparing series of thiazole-4- and -5-carboxylates containing alkyl and halogeno substituents. While both series of esters show i.r. carbonyl doublets caused by rotational isomerism, the more intense absorptions of the 4-carboxylates are the lower wavenumber components, whereas those of the 5-carboxylates are the higher wavenumber components. In both series the stronger bands arise from the thermochemically more stable forms; identification of these forms as the carbonyl O,S-syn-s-trans rotamers is more certain with the 4-carboxylates than with the 5-carboxylates.
- Published
- 1982
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