Catalytic Hydrogenation

A catalytic hydrogenation, or catalytic reduction, is a reduction of an organic compound using molecular hydrogen as the reducing agent and a transition metal as the catalyst. Most catalytic hydrogenations are addition reactions.
eg. 1:

eg. 2:

eg. 3:

eg. 4:

There are many transition metals used as catalysts in catalytic hydrogenation.  The most common ones are Pt, Pd, and Ni.

see also heat of hydrogenation

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