Chrysoidine

In a 250 ml. conical flask place 10 -5 g. of sulphanilic acid dihydrate, 

Reduction of methyl orange to / -aminodimethylaniline. Method 1. Dissolve 2 0 g. of methyl orange in the minimum volume of hot water and to the hot solution add a solution of 8 g. of stannous chloride in 20 ml. of concentrated hydrochloric acid until decolourisation takes place gentle boiling may be necessary. Cool the resulting solution in ice a crystalline precipitate consisting of sulphanilic acid and some p-aminodimethylaniline hydrochloride separates out. In order to separate the free base, add 10 per cent, sodium hydroxide solution until the precipitate of tin hydroxide redisaolves. Extract the cold solution with three or four 20 ml. portions of ether, dry the extract 

Method 2. Suspend 2-0 g. of methyl orange in 4 ml. of water, and add a small quantity of sodium hyposulphite (Na2S204). Heat the mixture and add more sodium hyposulphite until the colour is discharged. The sulphanilic acid remains in the solution as sodium sulphanilate and the p-aminodimethyl-aniline may be extracted with ether as in Method 1. 

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Amido-azo-benzene Amido-azo-toluene Aniline black Auramine Bismarck brown Brilliant indigo. 4 G. Chrysoidine... 

The first important event in the history of azo pigments was the discovery of the diazotization reaction by P. Cries in 1858. In 1875, Caro and Witt synthesized chrysoidine,... 

The B02 contains an azo group, -N=N-, as part of its molecular structure eonneeting two aromatic ring compounds, as depicted by figure 20. The ehemieal name of the B02 is 1,3-benzenediamine, 4-(phenylazo) with a moleeular weight of 248.72 g mol (C12H12N4HCI). This dye is also known as Oreozine Chrysoidine 4. 

V. Composizione a fumo arancione (Compn for orange-colored smoke) Chrysoidine 45, KC103 25, milk sugar 30 mineral coal flour 5%... 

Diamino-azobenzene, CgH. NiN.CgH (NH2)2- Called 2, 4-Di ami no-azobenzol 4-Benzolazo-phenylendiamin or Base des Chrysoidins in Ger. See Chrysordine, Vol... 

Zinc dust, hexachloroethane and aluminium Phosphorous pentoxide and phosphoric acid Sulfur, potassium nitrate and pitch Potassium chlorate, naphthalene and charcoal Zinc dust, hexachloroethane and naphthalene Silicon tetrachloride and ammonia vapour Auramine, potassium chlorate, baking soda and sulfur Auramine, lactose, potassium chlorate and chrysoidine Rhodamine red, potassium chlorate, antimony sulfide Rhodamine red, potassium chlorate, baking soda, sulfur Auramine, indigo, potassium chlorate and lactose Malachite green, potassium chlorate, antimony sulfide Indigo, potassium chlorate and lactose Methylene blue, potassium chlorate, antimony sulfide... 

Chromic acid cleaning mixture, 53 Chromophores, 1144-1146 three conjugated, 1146 two conjugated, 1146 typical single, 1145 Chrysoidine, 620, 623 Cinnamic acid, 707, 712, 1113... 

A sulphuric acid solution of m-phenylene diamine is added to the solution of the diazonium salt. The orange colour is due to diaminoazobenzene sulphate (Chrysoidine). Preparation 385. 

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