Studied On Hydrozirconation, Palladium-catalyzed Hydrostannylaiton And Dd-ition Reactions Of Diaryl Disulfides And Diselenides To Terminal Alkynes In Ionic Liquid

This dissertation consists of two parts:Part one:we investigated the hydrozirconation reaction of terminal alkynes with Cp₂Zr(H)Cl in ambient temperature ionic liquid [Bmim][PF₆] , it was found that the reaction proceeded smoothly at room temperature to afford the corresponding(E)-alkenylzirconium complexes highly region- and stereselectively In the presence of Pd(PPh₃)₄ catalyst , (E)-alkenylzirconium complexes underw-ent the cross-coupling reaction with arylhalides,providing a green procedure forthe stereoselective synthesis of (E)-1,2-disubstituted alkenes.We also investigated the hydrostannylation reaction of acetylenic esters,alkynyl sulfides and acetyle-nic sulfones with Bu3SnH in ambient temperature ionic liquid [Bmim][PF₆].the hydrostannylaion reactions proceeded smoothly at 60℃to give (E)-α-stannyl-α,β-unsaturated esters, (E)-α- stannylvinglsulfides and (E)-α-stannylsulfones highly stereo and regioselectively.This methodogy presents a green procedure for the stereoselective synthesis of 1,1-difunction group reagents containing tin .the ionic liquid [Bmim][PF₆]and palladium catalyst can be recycled many times wit-hout influences on the hydrozirconation and hydrostannylation reactions.Part two: we investigated the palladium-catalyzed addition reactions of dia-ryldisulfides and diselenides to terminal alkynes in ambient temperature ionicliquid [Bmim][PF₆],it was found that the addition reaction could proceed smooth-ly at 60℃to afford stereoselectively the corresponding (Z)-1,2-bis(arylthio)-1-alkenes and (Z)-1,2-bis(arylseleno)-1-alkenes in high yield compared to the reaction run in benzene, this methodology has the advantages of rate accelerate-on increase of yield and lower reaction temperature in additoin to the recyclingof the [Bmim][PF6]and palladium catalyst.