Abstract The cross-coupling reaction of (E)-and (Z)-alk-1-enyldialkylborane with (trimethylsilyl) ethynyl bromide proceeds in the presence of a catalytic amount of copper (II) acetylacetonate and a base under extremely mild conditions to provide conjugated enynes with a distal carbon-carbon triple bond. Employing sodium methoxide (1 M) as the base results in not only cross-coupling but also desilylation affording both (E)-and (Z)-alk-3-en- ...
