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13C NMR of coumarins. II—Khellactones: Spectroscopic criteria to establish the relative configuration of the dihydropyran ring

✍ Scribed by F. A. Macías; G. M. Massanet; F. Rodríguez-Luis; J. Salvá; F. R. Fronczek

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 365 KB
Volume: 27
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260270709

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✦ Synopsis

The "C NMR data of several khellactone derivatives are reported. 'H NMR-based stereochemical criteria are evaluated, and a new criterion based on "C NMR is proposed to establish the relative configuration at C-3' and (2-4' using A6C-3' between trans and cis isomers and AGgem(Me), values. The structure of bans-4'methylkhellactone was determined by x-ray analysis.

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