The u.v. spectra of β-amino-enones with trans-s-trans, cis-s-trans, and cis-s-cis structures are discussed. In the case of the s-trans-enone chromophore, the bathochromic shifts of β-amino-groups in the cis-position are 80–90 nm., and those of β-amino-groups in the trans-position are 60–70 nm. β-Monoalkylamino-enones show solvent effects which suggest the existence of tautomerism.
C. Kashima, M. Yamamoto and N. Sugiyama, J. Chem. Soc. C, 1970, 111 DOI: 10.1039/J39700000111
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