Unexpected cis-Selectivity in (Sylvestre) Julia Olefinations with Bu3Sn-Containing Allyl Benzothiazolyl Sulfones: Stereoselective Synthesis of 1,3-Butadienyl- and 1,3,5-Hexatrienylstannanes - Sorg, Achim; Brückner, Reinhard (Synlett, 2005)