4-Ethyltoluene is an organic compound with the formula CH3C6H4C2H5.

All are colorless liquids and all are used for the production of specialty polystyrenes.

Ethyltoluene is produced by ethylation of toluene: Over typical acid catalysts, this process gives a mixture of the 2-, 3-, and 4- isomers.

Using a modified zeolite catalyst, the alkylation is shape-selective for the 4- isomer.

[1] 4-Ethyltoluene is subjected dehydrogenation to give 4-vinyltoluene.