The intense absorption observed in the u.v. spectra of the 1-pyrroline 1-oxides is assigned to a π–π* transition of the azomethine system conjugated with the negatively charged oxygen substituent. The absorption undergoes a hypsochromic shift in going from nonpolar solvents.
L. S. Kaminsky and M. Lamchen, J. Chem. Soc. B, 1968, 1085 DOI: 10.1039/J29680001085
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