Flash vacuum pyrolysis of the dimethylamino-azapropenones (7)–(9) and -azapropenethione (12) gives nitrites and amides (or thioamide) in yields of ca. 30% by an electrocyclisation-ring cleavage mechanism. This is a minor pathway for the triarylazapropenones (14) and (15) for which homolytic cleavage of the C–N bond gives rise to the major products. The X-ray crystal structures of (10) and (12) show
的二甲基
氨基- azapropenones的闪热解真空(7) - (9)和-azapropenethione(12)给出了
亚硝酸盐和在产量酰胺(或
硫酰胺)CA。30%通过电环断裂机理。这是三芳基
丙烯酮(14)和(15)的次要途径,其中C–N键的均相裂解会产生主要产物。(10)和(12)的X射线晶体结构表明,共轭体系在s - Z构象中几乎是平面的,这是电环闭合所必需的。