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This paper describes the progress on the synthesis of organic selenides and tellurides and their application in organic synthesis.Low valent selenium and telluronium compounds having high reducing selectivity can be used to form carbon-hydrogen bonds as special reducing reagents.Telluronium ylides can react with aldehydes and ketones by Wittig-type condensation to produce (E)-configuration alkenes stereoselectively.α-Phenylselanyl arsonium ylides were prepared by transyl-idation reaction of arsonium ylides with phenylselanyl halides which can undergo Wittig-type reactions with carbonyl compounds to give (Z)-α-selanyl-α,β-unsaturated compounds with high stereoselectiv-ity.Zirconium,tin,boron,halogen,metal or hetero-atom were introduced in organoselenium and telluronium compounds as new difunctional group reagents.Under transition metal catalysis,the corresponding cross coupling reactions provide new methods of formation of carbon-carbon double bonds,which were used in the stereoselective synthesis of
This paper describes the progress on the synthesis of organic selenides and tellurides and their application in organic synthesis. Low valent selenium and telluronium compounds have high reducing selectivity can be used to form carbon-hydrogen bonds as special reducing reagents. Telluronium ylides can react with aldehydes and ketones by Wittig-type condensation to produce (E) -configuration alkenes stereoselectively. [alpha] -Phenylselanyl arsonium ylides were prepared by transyl-idation reaction of arsonium ylides with phenylselanyl halides which can be Wittig-type reactions with carbonyl compounds to give (Z) -α-selanyl-α, β-unsaturated compounds with high stereoselectiv-ity. Zirconium, tin, boron, halogen, metal or hetero-atom were introduced in organoselenium and telluronium compounds as new difunctional group reagents.Under transition metal catalysis, the corresponding cross coupling reactions provide new methods of formation of carbon-carbon double bonds, which were used in the stereosele ctive synthesis of