Alizarin Pyridine

Silk and wool fibres of Coptic textiles from fourth to twelfth century Carminic acid, laccaic acids A, B, C and E, xantholaccaic acid A, purpurin, xanthopurpurin, alizarin, monochloroalizarin, dichloroalizarin, ellagic acid, luteolin, apigenin, rhamnetin, indirubin HCI/EtOH, pyridine A ACN B H20 with TFA 278, 350 nm/ESI (+)... 

Group IV. Ca, Sr, and Ba This is a difficult separation. The metals are present as chlorides. The solvent used is pyridine containing 20 per cent (v/v) water and 1 per cent (w/v) potassium thiocyanate. The elution is allowed to proceed for 5-6 hours in an atmosphere saturated with respect to pyridine and also with a relative humidity of between 65 and 80 per cent the latter is attained by the use of a saturated aqueous solution of ammonium nitrate or chloride. The solvent front moves about 20 cm. The strip is dried, and then sprayed with a saturated alcoholic solution of alizarin to identify Ca, and with 0 5 per cent (w/v) aqueous sodium rhodizonate (freshly prepared) to reveal Ba and Sr. The RF values are Ca, 0-95 Sr, 0-75 Ba, 0-15 (see Fig. VI.5c). 

Barbituric Acid + Pyridine-4-carboxylic acid Fluoride Alizarin Fluorine blue + Lanthanum(III) ion... 

CAS 4403-90-1 EINECS/ELINCS 224-546-6 Synonyms Alizarin cyanine green F 2,2 -(1,4-Anthraquinonylenediimino) bis (5-methylbenzenesulfonic acid) disodium salt 6,6 -(1,4-Anthraquinonylenediimino) di-m-toluenesulfonic acid disodium salt Benzenesulfonic acid, 2,2 -(1>4-anthraquinonylenediimino) bis (5-methyl)-, disodium salt Benzenesulfonic acid, 2,2 -[(9,10-dihydro-9,10-dioxo-1,4-anthracenediyl) diimino] bis (5-methyl)-, disodium salt Cl 61570 D C Green No. 5 2,2 -[(9,10-Dihydro-9,10-dioxo-1,4-anthracenediyl) diimino] bis (5-methylbenzenesulfonic acid) disodium salt Classification Anthraquinone color Empincal C28H2oN2Na208S2 Properties Grn. powd. sol. 0.5-1.0 g/100 ml water (21 C) si. sol. in acetone, alcohol, pyridine insol. in chloroform, toluene dull blue sol n. in cone. H2SO4, turning turquoise on dil. m.w. 622.58 m.p. 340 C... 

In view of its constitution, Alizarin Blue (I) might be expected to display the characteristics of alizarin (page 96) and 8-hydroxyquinoline (page 335). This is not the case, as shown by the facts that it is neither soluble in alkali as is alizarin nor in dilute acids as is oxine. Probably Alizarin Blue is a chelate compound as represented in (la). Solutions can be prepared in dioxane, pyridine, acetic anhydride, concentrated sulfuric acid. These solutions react with strongly acid solutions of copper salts to produce a com-flower-blue crystalline precipitate, whose constitution as an inner complex compound is shown in (II). 

Reagent Saturated solution of Alizarin Blue in pyridine 1. F. Feigl and A. Caldas, Anal. Chim. Acta, 8 (1953) 117. 

Procedure. Filter paper is impregnated with a saturated alcoholic solution of alizarin, or with a solution of quinalizarin in a mixture of pyridine and acetone. A drop of the test solution is placed on the dried paper. The test solution should be neutral or slightly acid with acetic acid. The moist fieck is held over ammonia and then immersed in a saturated aqueous solution of boric acid. The violet ammonium alizarinate or quinalizarinate decomposes, and the red or violet indium lake is easy to see against the yellow or red paper. 

Procedure. A drop of dilute hydrochloric acid is added to 100 ml of the water being tested and one or two drops of a 6 % aqueous cupferron solution introduced. (Small amounts of copper may produce no visible precipitate.) The treated water is shaken with 6 ml of chloroform. After separating the two layers, the chloroform is evaporated in a small porcelain crucible, a drop of a saturated pyridine solution of alizarin blue is added to the residue, and the pyridine then volatilized. The residue is treated with a drop or two of acetic anhydride. A blue residue, that adheres firmly to the porcelain, indicates the presence of traces of copper. 

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