Transformation of Reactive Isochromenylium Intermediates to Stable Salts and Their Cascade Reactions with Olefins Zhi-Long Hu Wen-Jian Qian Sheng Wang Shaozhong Wang Zhu-Jun Yao 10.1021/ol9019524.s002 https://acs.figshare.com/articles/dataset/Transformation_of_Reactive_Isochromenylium_Intermediates_to_Stable_Salts_and_Their_Cascade_Reactions_with_Olefins/2821291 Transformation of reactive isochromenylium intermediates to the corresponding storable and stable reagents has been achieved, and a number of isochromenylium tetrafluoroborates (ICTBs, <b>1</b>) have been conveniently prepared and characterized. Direct metal-free treatment of isochromenylium tetrafluoroborate <b>1a</b> with olefins afforded a variety of polycyclic frameworks <b>4</b> via mild cascade reactions. Starting from the prefunctionalized <i>o</i>-alkynylbenzaldehydes, a one-pot metal-free procedure of intramolecular cascade annulation to 2,3-dihydrophenanthren-4(1<i>H</i>)-one derivatives was also developed. 2009-10-15 00:00:00 cascade reactions isochromenylium tetrafluoroborate 1 Cascade Reactions isochromenylium tetrafluoroborates intramolecular cascade annulation reactive isochromenylium intermediates polycyclic frameworks 4 Stable Salts ICTB Reactive Isochromenylium Intermediates Olefins Transformation