Conversion of Non-Activated Alkenes into Cyclopropanes withLithiated Sulfones under Nickel Catalysis.-In contrast to known methods, the new title reaction of lithiated sulfones with cyclic alkenes, such as (XI) or (XIII), affords almost exclusively the exo isomers. Moreover, the new reaction has a definite preference for the less substituted double bonds, whereas the known methods give better results with more substituted ones. - (GAI, Y.; JULIA, M.; VERPEAUX, J.-N.; Bull. Soc. Chim. Fr. 133 (1996) 9, 817-829; Dep. Chim., CNRS, Ec. Norm. Super., F-75005 Paris, Fr.; EN)
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