Journal or Book Title
The Journal of Organic Chemistry
Lewis acid-mediated Diels−Alder reactions of quinol lactone 2 gave regioselectivity opposite to that of the uncatalyzed reaction. Compound 12 is proposed as the reactive intermediate generated by the reaction of 2 with stannic chloride.
American Chemical Society
Kraus, George A. and Cui, Wenge, "Diels−Alder Reactions of Quinol Lactones: A Change of Regioselectivity with Stannic Chloride Catalysis" (2002). Chemistry Publications. 472.