Abstract
Zirconum alkenyls and dienyls of E configuration obtained by the hydrozirconation of alkynes of conjugated enynes containing a terminal triple bond undergo the Zr Te exchange reaction by treatment with C4H9TeBr or C4H9Tel in THF at −78 °C. The Zr Te exchange reaction proceeds with total retention of configuration and with complete stereoselectivity at the carbon 1, furnishing (E)-butyltelluro alkenes (64 - 86% yields) and (E)-1-butylteluro-1,3-dienes (68 – 75%, yields) Vinylic tellurides were transformed into α,β-unsaturated esters and carboxylic acids with total retention of the regio- and stereochemistry via vtnyl lithium intermediates
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