The low-melting compounds 1,4-di­ethyl-, 1,2-diethyl- and ethyl­benzene

Crystals of 1,4-diethyl- and 1,2-diethyl­benzene, both C₁₀H₁₄, and ethyl­benzene, C₈H₉, have been grown in situ. The mol­ecules of 1,4-diethyl- and 1,2-diethyl­benzene are located about a centre of inversion and across a twofold axis, respectively. In both mol­ecules, the terminal methyl groups are located on opposite sides of the plane of the aromatic ring. In the crystal structures of all three compounds, mol­ecules are linked together by (Ar)C—H...π and CH₂...π contacts. The methyl H atoms do not form close contacts with any of the aromatic π systems.