The conformation of the red form of 2,2′‐methylenediquinoline

Abstract
The studies by Scheibe and his coworkers revealed that the conformation of the red form of 2,2′‐methylenediquinoline (I) is di‐cis. This paper reports a direct proof of the conformation of the red form of 8‐bromo‐2,2′‐methylenediquinoline (III) by X‐ray analysis.