Journal or Book Title
Journal of American Chemical Society
The lignan paulownin was prepared in a seven-step route from piperonal. The key step was a type I1 photocyclization reaction wherein two of the four stereogenic centers were introduced.
American Chemical Society
Kraus, George A. and Chen, Li, "A total synthesis of racemic paulownin using a type II photocyclization reaction" (1990). Chemistry Publications. 648.