2, 5-Diphenylpyrrole-3-diazonirlm chloride (SIII) has been shown to undergo the azo coupling reaction leading to the new compound class of azopyrroles (I). Coupling of XI11 with pyrroles carrying substituents in a-positions furnishes 3, 3'-azopyrroles (Ia and Ib), while the coupling products with pyrroles having free a-positions have been assigned the structure of 2, 3'-azopyrroles (IC through Ih). Structure proof of I has been adduced by ...
