Cyclohexylbenzene (or phenylhexamethylene, as it was initially called) is the organic compound with the structural formula C6H5−C6H11.

Cyclohexylbenzene was first obtained in 1899 by Markovnikov's student Nikolay Kirsanov (1874–1921).

[3][4] The process can proceed using benzene as the exclusive organic precursor.

Its partial hydrogenation gives cyclohexene, which alkylates the unhydrogenated benzene.

[5] It is also generated by the hydrodesulfurization of dibenzothiophene,[6] and ExxonMobil took a patent in 2009 for a process based on direct hydroalkylation of two benzene molecules.