Reduction of alkyne to alkene is brought about by any one of the following reducing agents.
(i) Alkali metal dissolved in liquid ammonia.
(ii) Hydrogen in presence of palladium poisoned with BaSO4 or CaCO3 along with quinoline (Lindlar’s catalyst).
(iii) Hydrogen is presence of Ni2B (nickel boride).
Alkali metal dissolved in liquid ammonia produces nearly 100% trans alkene by the following mechanism:
Na + liq NH3 ® Na+ + es (solvated electron)
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