Synthesis of (E)-1,4-bis(organyl) but-1-en-3-ynes by lithium-tellurium exchange reaction on (Z)-1-butyltelluro-1,4-bis(organyl) but-1-en-3-ynes

Article abstract of DOI:10.1016/S0040-4039(00)74184-0

1,4-bis(organyl)-1,3-butadiynes react with dibutyl ditelluride and sodium borohydride in ethanol under reflux to give (Z)-1-butyltelluro-1,4-bis(organyl) but-1-en-3-ynes, which by treatment with butyllithium followed by water give (E)-1,4-bis(organyl) but