Acids anthraquinone

With concentrated sulfuric acid, anthraquinone forms oxonium salts, thus falling into a class of compounds known as " oxygen bases" (15). In an aqueous solution, anthraquinone has an ionisation constant equal to 7 x 10 and a of 7.4 (16). 

N.A. Chrysophanic acid, anthraquinones, lecithin.99 Mildly sedative, nourishes the blood, a tonic. 

N.A. Galium aparine L. Iridoid valepotriates, polyphenolic acids, anthraquinones, tannins.99107 For vitamin C deficiency. 

For some substances, for example rubber, an antioxidant means an age-resistor and substances like tannic acid, anthraquinone or aniline are used. It is said that antioxidants possess antioxidant power ... 

Aluminium chloride Anthracene Anthranilic acid Anthraquinone Benzanthrone Benzoic acid Calcium Camphor... 

Other Acid Anthraquinone Dyes. In addition to the dyes in the preceding classes, a whole series of specially developed products is available. For instance, derivatives of the anthrimide or carbazole series are known to be very light-fast gray and brown wool dyes. The post-sulfonation products of 1,5- and 1,8-diarylami-noanthraquinones are violet dyes commonly applied as mixtures. 

Azo dres, azrnes. acid anthraquinone dyes Azo dyes Azo dyes... 

Aminoanthraquinone can be sulfonated relatively easily in the 2 position by treating it with fuming sulfuric acid in the presence of bisulfate. The l-aminoanthraquinone-2-sulfonic acid thus formed can also be prepared smoothly by baking the acid sulfate of 1-amino-anthraquinone at 200°C. It is a very important starting material for the preparation of valuable acid anthraquinone dyes. ... 

The plant contains iridoid glycosides asperuloside (120) monotropein and aucubin (19), phenolic acids caffeine, gallic acid, anthraquinone derivatives, flavonoids, coumarins, citric acid and red dye. It has been employed in the form of an infusion, as aperient, diuretic, refrigerant, alternative and antiscorbutic. Extract of leaves used as astringent, plant paste applied on skin disease [69,153]. 

ANTHRACENES N-Lithium 2,2,6,6-tetramethylpiperide. Polyphosphoric acid. ANTHRAQUINONES Potassium hydroxide. 

Anthracene Anthranilic acid Anthraquinone Antimony pentachloride Benzaldehyde Benzidine dihydrochloride 2,2 -Benzidinedisulfonic acid Benzoguanamine Benzotrifluoride Benzoyl chloride N-Benzylamine N-Benzyl-N-ethyl-m-toluidine Bisphenol A Bromine 4-Bromochloro benzene Butyl acetoacetate n-Butylamine t-Butylamine Ceteareth-15 o-Chloroaniline p-Chloroaniline m-Chlorobenzoic acid o-Chlorobenzoic acid p-Chlorobenzoic acid m-Chlorobenzotrifluoride o-Chlorobenzotrifluoride p-Chlorobenzotrifluoride Chloroform 4-Chloro-2-nitroaniline 2-Chloronitrobenzene... 

UV-visible spectrophotometry is still important for LC and CE detection of numerous important naturally occurring groups of substances, such as flavonoids, phenolic acids, anthraquinones, and cou-marins, because they have very characteristic UV spectra. 

Bromamine acid (l-amino-4-bromoanthraquinone-2-sulfonic acid) is the most important intermediate for the production of acid anthraquinone dyestuffs. 

Acidic anthraquinones in which both hydroxy groups in the C-ring have been methylated occur in Cortinarius armillatus and C. miniatopus, while cortinaric acid (313) and its 8-0-methyl ether (314) have been isolated from Cortinarius elegantior where they are partly responsible for the characteristic pink colour produced in the stem base with ammonia. The structures of the latter pigments have been confirmed by synthesis involving chromium trioxide oxidation of the peracetyl derivatives of endocrocin (303) and dermolutein (305), respectively 387). 

Fluorescein (C. I. 45350) and its halogen substitution products such as eosin (C. I. 45380) may be separated with the help of solvents 5—10 [28, 49, 61, 83]. According to Rettie and Haynes [61], various acid anthraquinone dyes can be separated on silica gel G or cellulose layers, using solvent 15. 

Sodium dichromate/acetic acid Anthraquinones from anthracenes... 

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