1,1′-Bi-(2-aryl-1,2-dihyrophthalazinylidenes): potential new pigment. Relief of strain by a trans-folded alkene linkage
Abstract
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.