Nuclear magnetic resonance conformational studies of C-substituted pyrrolecarbaldehydes. Part II. Barrier to internal rotation in 5-substituted pyrrole-2-carbaldehydes

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Abstract
A study of the variations of the n.m.r. spectra of ethyl 5-formylpyrrole-2-carboxylate and pyrrole-2,5-dicarbaldehyde with temperature allowed a determination of the activation parameters by lineshape analysis of the formyl signals. The influence of the nature of the substituent on the spectrum is considered.