Study of the 5-deuterio-analogues shows that the multiple i.r. carbonyl absorptions of furan- and thiophen-2-carbaldehydes, alkyl furan-2-carboxylates, and 2-furoyl chloride are caused by Fermi resonance and/or rotational isomerism.
D. J. Chadwick, J. Chambers, G. D. Meakins and R. L. Snowden, J. Chem. Soc., Chem. Commun., 1972, 742 DOI: 10.1039/C39720000742
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