1-Hydroxy-2-aryl-1,2-dihydrophthalazines are dimerized to give 1,1′-bi-(2-aryl-1,2-dihydrophthalazinylidenes); an X-ray crystal structure shows a relief of strain in these compounds by a trans-folded alkene linkage and a buckling of the phthalazinyl ring.
R. N. Butler, A. M. Gillan, P. McArdle and D. Cunningham, J. Chem. Soc., Chem. Commun., 1987, 1016 DOI: 10.1039/C39870001016
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