Answer
The Heck reaction is a palladium-catalyzed carbon-carbon bond-forming reaction that involves the coupling of an aryl or vinyl halide with an alkene or alkyne. The reaction is named after its discoverer, Richard F. Heck. The reaction proceeds via a catalytic cycle involving palladium(0) and palladium(II) intermediates. The byproduct of the Heck reaction is typically a salt, such as sodium chloride or potassium chloride.