2020-01-12 | [8+2] vs [4+2] Cycloadditions of Cyclohexadienamines to Tropone and Heptafulvenes—Mechanisms and Selectivities – J. Am. Chem. Soc. Xiangyang Chen, Mathias Kirk Thøgersen, Limin Yang, Rune F. Lauridsen, Xiao-Song Xue, Karl Anker Jørgensen, and K. N. Houk*.