"Platinum and palladium are the most common laboratory catalysts for alkene hydrogenations. … Catalytic hydrogenation, unlike most other organic reactions, is a heterogeneous process rather than a homogeneous one. … An interesting feature of catalytic hydrogenation is that the reaction is extremely sensitive to the steric environment around the double bond. As a result, the catalyst usually approaches only the more accessible face of an alkene, giving rise to a single product. … Alkenes are much more reactive than most other unsaturated functional groups toward catalytic hydrogenation, and the reaction is therefore quite selective. … In addition to its usefulness in the laboratory, catalytic hydrogenation is also important in the food industry, where unsaturated vegetable oils are reduced on a large scale to produce the saturated fats used in margarine and cooking products."
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John McMurry, Organic Chemistry 8th ed. (2012), Ch. 8 : Alkenes: Reactions and Synthesis
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Hydrogenation
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