By introducing four alkyl chains to quinacridone, the soluble derivatives can be spread as monolayers on water surface and their surface pressure – area isotherms were found to depend significantly on the temperature and the alkyl chain length. Different orientations and packings were realized, depending on the alkyl substituents.

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2,3,9,10,16,17,23,23‐Octaalkylphthalocyanines and their copper complexes having long alkyl side chains of odd numbers of carbons (C7H12, C9H19, C11H23 and C13H27) were prepared. Their thermal properties and solubilities were examined.

The synthesis of 4,11‐dialkylthioquinacridones and 5,12‐dialkyl‐4,11‐dialkylthioquinacridone from o‐alkylthioanilines and diethyl 2,5‐dioxo‐1,4‐cyclohexanedicarboxylate is described. These compounds are easily soluble in organic solvents in contrast to unsubstituted quinacridone.