Electronic control of the stereoselectivities of electrocyclic reactions of cyclobutenes against incredible steric odds

Experimental studies of the electrocyclic reactions of 2- and 3-tert-butyl-3-(trimethylsiloxy)cyclobutene and of 3-methoxy-3-fert-butylcyclobutene confirm ab initio computational predictions. © 1988, American Chemical Society. All rights reserved.