Fragmentation of 4-Sulfonylbicyclo[3.1.0]hexan-2-ones as the Key Step in the Enantioselective Synthesis of (1R)-cis-Chrysanthemic Acid Involving Desymmetrization of 3,3,6,6-Tetramethylbicyclo[3.1.0]hexane-2,4-dione - Krief, Alain; Kremer, Adrian (Synlett, 2007)