Isomerization

In chemistry, isomerization or isomerisation is the process in which a molecule, polyatomic ion or molecular fragment is transformed into an isomer with a different chemical structure.

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[3] Skeletal isomerization occurs in the cracking process, used in the petrochemical industry to convert straight chain alkanes to isoparaffins as exemplified in the conversion of normal octane to 2,5-dimethylhexane (an "isoparaffin"):[4] Fuels containing branched hydrocarbons are favored for internal combustion engines for their higher octane rating.

Aldose-ketose isomerism, also known as Lobry de Bruyn–van Ekenstein transformation, provides an example in saccharide chemistry.

When a pair of CO are bridging, cis and trans isomers are possible depending on the location of the C5H5 groups.