Ethylene Glycol → 5,12-Dihydro-2,9-dimethylquino(2,3-b)acridine-7,14-dione

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A solution was prepared by mixing 2.0 g of 2,5-di-(p-toluidino)-terephthalic acid, 0.1 g of p-toluenesulfonic acid, 15 mL of ethylene glycol, and 20 mL of dimethylformamide. A fused silica glass capillary (equivalent diameter, 0.20 mm; and length, 4.0 m) was provided as a reactor, and was fixed in such a manner that a portion of 2.5 m length out of the whole capillary was immersed in an oil bath. The oil bath was heated to 150° C., and this solution was fed into the reactor at a flow velocity of 1.1 mL/hr (retention time: 5 minutes) with a syringe pump. A pigment having a vivid magenta color was obtained from the discharge port of the capillary.

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