The torquoselectivity theory predicts the direction of ring-opening of
a cyclobutene substituted by electron donors and acceptors. See William
R. Dolbier, Jr., Henryk Koroniak, K. N. Houk, and Chimin Sheu, Acc. Chem.
Res., 1996, 29, 471-477.
This art illustrates some of the research of Prof. Ken Houk's group at UCLA.
Note: the images here are reduced in color depth and resolution for viewing on the web. They are not print quality. To obtain files suitable for reproduction in printed form contact the author, Nicholas C. DeMello Ph.D.