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À propos de : Titanocene(II)-Promoted Stereoselective Alkenylation Utilizing(Z)-Alkenyl Sulfones        

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  • Titanocene(II)-Promoted Stereoselective Alkenylation Utilizing(Z)-Alkenyl Sulfones
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  • The stereoselective alkenylation of unsaturated compounds by means of a (Z)-alkenyl sulfone-titanocene(II) system is described. Treatment of alkynes and (Z)-alkenyl methyl sulfones with the titanocene(II)reagent Cp2Ti[P(OEt)3]2 produced conjugated dienes. This alkenylation system is also applicable to polarCO bonds; the simple mixing of carbonyl compounds, (Z)-alkenyl methyl sulfones, and the titanocene(II) reagent formed allylic alcohols. The advantages of alkenylation are that it requires no prepreparationof the alkenylmetal reagent and that it proceeds with complete stereoselectivity.
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