Application of the selective 13C{1H} nuclear Overhauser effect to structure elucidation of photoadducts derived from maleic anhydrides and thiophene
✍ Scribed by V. Leon; R. A. Bolívar; M. L. Tasayco; R. Gonzalez; C. Rivas
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 421 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
The 13C NMR spectra of a representative series of photoadducts derived from methylmaleic anhydrides and thiophene, containing the same basic carbon skeleton, were studied in order to establish a model for futnre structure elucidation of similar compounds. Selective heteronnclear 13C{114 NOE was applied to stereochemical studies on the same compounds with the dual purpose of confirming previous assignments and to gain experience in the use of this technique, rarely applied in organic chemistry. The technique was employed in two different ways, by irradiating the selected proton resonance with and without modulation [um=iJ(CH)].