One-Pot Synthesis of Novel Dibenzoxanthenes, Diarylbutanes, and Calix[4]resorcinarenes via Consecutive Pyrrolidine Ring-Closure/Ring-Opening Reactions. - Smolobochkin, Andrey V.; Gazizov, Almir S.; Burilov, Alexander R.; Pudovik, Michail A. (Journal of Chemistry, 2019)