1-Cyano-1,2-dihydro-2-hydroxyquinolines when subjected to low-temperature rigid-matrix photochemistry and then warmed give rise principally to N-cyano-o-aminocinnamaldehyde. This result verifies the fact that the core molecular structure of the photocoloured forms of the 1,2-dihydroquinolines previously suggested is correct.
J. Kolc and R. S. Becker, J. Chem. Soc., Perkin Trans. 2, 1972, 17 DOI: 10.1039/P29720000017
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