Vat Yellow 28

Preparation

(a) Aluminum chloride with sulfuric acid or imine of N-(9,10-dioxo-9,10-dihydroanthracene-1-yl)-1-aminoanthracene-9,10-dione; (b) will nitrobenzene 1-Nitro-2-chloroanthraquinone?and copper heated and then reduced to the 1,1′-Diamino-2,2′-bianthraquinone, then sulfuric acid or chlorine zinc cyclization; (C) In nitrobenzene using copper processing?2-Bromo-1,1′-iminodianthraquinone.

Synthesis

1,1'-Dianthrimide-2,2'-carbazole is prepared from Anthraquinone Dyes and Intermediates 35 1,1'dianthrimide in AlCl3-NaCl melts or in AlCl3 – pyridine melts .

Properties and Applications

red light yellow. Soluble in 1, 2, 3, 4-Tetrahydronaphthalene, Xylene. The strong sulfuric acid for palm red light, after diluted orange precipitation; In alkaline solution for insurance powder red brown; In the acidic insurance powder solution for yellow brown, a green fluorescent.