You can't hydrogenate and keep the same formula C8H8.

Trans compounds form during the usual methods used to hydrogenate polyunsaturated fatty acids, which are liquid at room temperature.

In benzene, however, 23.4 kJ (5.6 kcal) are needed to hydrogenate one mole of double bonds.

Rosefield's patented homogenization solution was to partially hydrogenate the peanut oil to make it more miscible with the peanuts.

Commercially, Rhodium complexes containing phosphine-ligands are used to hydrogenate prochiral enamides.

At pressures of hydrogen close to 1atm at room temperature, it is used to hydrogenate a wide variety of alkenes and alkynes.

Ryōji Noyori introduced the use of ruthenium-based catalysts that could be used to asymmetrically hydrogenate several important types of substrates.

The RuCl (diphosphane) (diamine) catalyst can hydrogenate simple cyclic ketones diastereoselectively.

One advantage of Crabtree's catalyst is that it is about 100 times more active than Wilkinson's and can hydrogenate even tri- and tetrasubstituted alkenes.

For example, they have been used to hydrogenate a diaryl ketone using isopropanol as a hydrogen source., MIC complexes are being considered as green chemistry catalysts.

These catalysts have been used in the synthesis of natural products and able to hydrogenate certain difficult substrates, such as unfunctionalized alkenes, enantioselectively (generating only one of the two possible enantiomers).

Procter & Gamble researchers learned how to extract the oil, refine it, partially hydrogenate it (causing it to be solid at room temperature and thus mimic natural lard), and can it under nitrogen gas.

Thus, a carefully chosen catalyst can be used to hydrogenate some functional groups without affecting others, such as the hydrogenation of alkenes without touching aromatic rings, or the selective hydrogenation of alkynes to alkenes using Lindlar's catalyst.

Enantiopure Ru[SYNPHOS]Br was shown to selectively hydrogenate racemic α-amino-β-ketoesters to enantiopure aminoalcohols, as shown below utilizing (R)-SYNPHOS.