1. Department of Chemistry , University of Malaya , 59100, Kuala Lumpur, Malaysia;2. Department of Chemistry , National University of Singapore , 10, Kent Ridge, Crescent, Singapore , 0511
Abstract:
The 13C chemical shifts and CH coupling constants for 6 substituted 4-ylidenebutenolides are reported. The CH coupling constants are useful in helping to determine the stereochemistry of the substituted exocyclic double bond.