Conformational analysis in heteroaromatic carbonyl compounds. Part I. Radical anions of thiophen-2,5-dicarbaldehyde and related derivatives
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 6,p. 751-754
- https://doi.org/10.1039/p29720000751
Abstract
The room-temperature e.s.r. spectrum of the photolytically generated radical anion of thiophen-2,5-dicarbaldehyde shows the existence of two of the three possible rotational isomers. The less stable could be straightforwardly identified as the O-cis–trans because of the non-equivalence of the thiophen proton splittings. Examination of a number of derivatives having different steric requirements allowed the assignment of the O-cis–cis conformation to the other rotamer.Keywords
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