2-(2-Benzoylethynyl)-5-phenylpyrrole: fixation of cis- and trans-rotamers in a crystal state

Abstract

2-(2-Benzoylethynyl)-5-phenylpyrrole forms two crystal modifications with the carbonyl group oriented in cis- and trans-positions relative to the nitrogen atom thus representing the first example of the solid state stable rotamers around the CC bond system.