1,1'-Biphenyl, mixt. with 1,1'-oxybis(benzene) → Quinacridone

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(b.1) A suspension of 37.8 parts of dimethyl 3,6-dihydro-2,5-dianilinoterephthalate in 200 parts of ®Dowtherm A is added dropwise to 150 parts of boiling ®Dowtherm A. The mixture is then kept at the boil for a further 90 minutes. After approx. 100 parts of the solvent have been distilled off, the mixture is cooled to approx. 140° C., after which 25.4 parts of iodine are added and the mixture is kept at the boil for a further 4 hours. Working up is effected as described earlier in the text under "Method A". 27.8 parts of quinacridone in the β-crystal phase are obtained, which corresponds to a yield of 89% of theory (relative to dimethyl 3,6-dihydro-2,5-dianilinoterephthalate.

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