Alkynes can be reduced directly to alkanes by the addition of H2 in the presence of Ni, Pt or a catalyst. The addition reaction takes place in two steps. lt is not possible to isolate the mediate alkene under the above reaction conditions. By using Lindlar’s catalyst [Pd on CaCO3 HaCOO)2 Pb] nickel boride or palladised charcoal, alkynes can be partially hydrogenated to syn product.
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