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.

Synthesis of Soluble Quinacridones.-In contrast to unsubstituted quinacridone, the derivatives (IV) and ( VI) are easily soluble in organic solvents. This remarkable solubility implies that the intermolecular hydrogen bonds of quinacridone are weakened by steric hindrance of the alkylthio groups at the 4 and 11 positions in (IV); in (VI) they are broken by N-alkylation. -(KITAHARA, K.; YANAGIMOTO, H.; NAKAJIMA, N.; NISHI, H.; J.

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