Use of selective heteronuclear 13c1h noe measurements. a second note of warning on the assignment of structure to the products formed in the reactions between 4-hydroxy-2h-pyran-2-ones and carbonyl compounds.

J. Cervello, M. Gil, P. de March, J. Marquet, M. Moreno-Mañas, J. L. Roca, F. Sanchez-Ferrando

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15 Citations (Scopus)

Abstract

Further examples of the occurrence of intramolecular translactonization during condensation of 4-hydroxy-6-methyl-2H-pyran-2-one, 1, or 4-hydroxycoumarin, 4, with carbonyl compounds are desoribed. The structure of previously misassigned products 6a,b is proven by NMR techniques. Application of the HETNOE method to the distinction between structures 9 and 10 is demonstrated. © 1987.
Original languageEnglish
Pages (from-to)2381-2387
JournalTetrahedron
Volume43
Issue number10
DOIs
Publication statusPublished - 1 Jan 1987

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