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Acetylenic tellurides react with Cp 2 Zr(H)Cl in THF at room temperature to give the α-zirconated vinyl telluride intermediates 39, which react with a wide range of electrophiles to give several types of trisubstituted olefins, such as α-halo vinyl tellurides, ketene telluro(seleno) acetals, ketene telluro acetals, and vinylic tellurides of Z configuration. Acetylenic selenides undergo similar...
Zirconium alkenyls and dienyls of E configuration, obtained by the hydrozirconation of alkynes or conjugated enynes containing a terminal triple bond undergo the Zr/Te exchange reaction by treatment with C 4 H 9 TeBr or C 4 H 9 TeI in THF at -78 °C. The Zr/Te exchange reaction proceeds with total retention of configuration and with complete stereoselectivity at the...
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