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Geminal 13C–13C coupling constants in αβ-unsaturated azlactones and the acids and esters derived from their hydrolysis are large and strongly dependent on configuration. Coupling constants in simple 13C1-labelled carboxylic acids are also reported; vicinal couplings show a strong geometric dependence but the geminal couplings depend mainly on hybridisation.
P. A. Chaloner, J. Chem. Soc., Perkin Trans. 2, 1980, 1028 DOI: 10.1039/P29800001028
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