Phthalonitrile → Dichlorotitanium phthalocyanine

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In 100 g of α-chloronaphthalene, 5.0 g of o-phthalodinitrile and 2.0 g of titanium tetrachloride were stirred for 3 hours under heating at 200° C. Thereafter the reaction mixture was cooled to 50° C. and the crystals precipitated were filtered to give a paste of dichlorotitanium phthalocyanine. Next, this product was washed with 100 ml of N,N'-dimethylformamide heated to 100° C., with stirring, and subsequently the washing was repeated twice using 100 ml of methanol kept at 60° C., followed by filtration. The resulting paste was stirred at 80° C. for 1 hour in 100 ml of deionized water, followed by filtration to give blue oxytitanium phthalocyanine crystals. Yield: 4.3 g.

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