At -55-degrees-C SO2 adds to 4-[(tert-butyl)dimethylsilyloxy]-1-methoxy-2,3,6,7-tetramethylidenebicyc lo[3.2.1]octane reversibly and selectively onto the s-cis-butadiene moiety at C(2), C(3) giving a single regioisomeric sultine. At -45-degrees-C the cheletropic addition of SO2 occurs selectively giving the monosulfolene attached at C(2), C(3).
Hubert Girault, Pekka Eero Peljo, Thomas James Stockmann, Haiqiang Deng
Xile Hu, Heron Vrubel, Daniel Andreas Merki
Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Zhaowen Dong, Paul Varava