Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Chemical shifts and long-range 13C, 1H coupling constants to the two carbonyl C atoms were determined for a series of ethyl 2-acyloxy-2-alkenoates. The 3J(C,H) coupling constant across the double bond is 9.5-10.1 Hz for the E- and 2.9-3.8 Hz for the Z-isomer. 3J(C,H) values, therefore, may be used as a criterion for E/Z differentiation even if only one isomer is available. 13C chemical shift data, in contrast, cannot be employed for a straightforward differentiation.
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