The synthesis and photochemical reactions of some 1,4-diaza-1,3-dienes have been studied. The photochemical reactivity of these compounds falls into two distinct types. Thus the diazadienes (7a–d) undergo hydrogen abstraction and cyclisation to 2H-imidazoles while diazadiene (7e) cyclises by either of two six-electron paths to yield either phenanthridine or quinoxaline derivatives.
D. Armesto, W. M. Horspool, M. Apoita, M. G. Gallego and A. Ramos, J. Chem. Soc., Perkin Trans. 1, 1989, 2035 DOI: 10.1039/P19890002035
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