Indigo compounds

This technique was adapted to thin layer chromatography by Acker-mann (43), The substrates used were 1-naphthylacetate, 2-azobenzene-l-naphthylacetate, and indoxylacetate. Sensitivity was in the nanogram range. A later study (44) was carried out using different activation techniques in an attempt to make the procedure more sensitive. Mendoza et al, (45) used indoxyl and substituted indoxyl and naphthyl acetates as substrates. Indigo compounds produced by the hydrolysis of these... 

Indigo is a dark blue, water soluble dye that has been in use for a long time. The picture shows first the indigo compound synthesized by Baeyer Laboratories in 1890. 

Cuprous iodide s. under CgH Li Barium oxide dimethylformamide N-Methylation of indigo compounds... 

Oxygen sodium carbonate Indigo compounds from indoxyls s. 11,806... 

Supplement (combined with Volumes XXIV and 1936 3458-3793 methane, 25. Pyrimidine, 89. Pyrazine, 91. Nicotine, 110. Dipyridyl, 199. Phenanthroline, 227. Hydroxy compounds, 348 Cinchonine, 424. Quinine, 511. Indigo white, i... 

Supplement 1955 3634-3793 Sulphonic acids Indigo-disulphonic acid (indigocarmine), 304. Amines, 308. Keto-ammes Pyramidone, 452. Allan-toin, 474. Murexide, 499. Amino-carboxylic acids Histidine, 513. j Hydrazines, 531. Azo compounds, 535. 1... 

Analysis. Indium can be detected to 0.01 ppm by spectroscopic analysis, using its characteristic lines in the indigo blue region, at wavelengths 4511.36, 4101.76, 3256.09, and 3093.36 nm. Procedures for the quantitative deterrnination of indium in ores, compounds, alloys, and for the analysis of impurities in indium metal are covered thoroughly in the Hterature (6). 

Many sodium compounds are made from sodium. Sodium is employed as a reducing agent in numerous preparations, including the manufacture of dyes (see Dyes and dye intermediates), eg, indigo herbicides (qv) (128) pharmaceuticals (qv) high molecular weight alcohols (129) perfume materials (130) (see Perfumes) and isosebacic acid (131,132). 

Hydroxyindole (181) represents a well known example of a compound in which the hydroxyl group is to the ring heteroatom. The equilibrium mixture again contains mainly the carbonyl form (182), indoxyl. Deprotonation gives a reactive ambident anion which can be methylated either on oxygen or C-2 (Scheme 73). Indoxyl is easily oxidized to indigo (184), which may be formed by dimerization of the radical (183) produced by electron loss from the anion. 

Hsynthesis from, 3, 767 Indenobenzazepines pharmacological properties, 7, 546 Indenone oxide, 2,3-diphenyl-photochromic compound, 1, 385 In deno[ 1,2-c][ 1,2,4]triazines synthesis, 3, 434 Indicated hydrogen nomenclature, 1, 33 Indigo, I, 317, 318-319, 4, 370 Baeyer synthesis, 1, 319 colour and constitution, 1, 344-345 molecular structure, 4, 162 photochromic compound, 1, 386 synthesis, 4, 247 Indigoid dyes... 

Another route presented in the work cited above also finally furnished 16 and 17, although in this case, the intermediate 62, prepared in three steps from indigo (63) via the 0-acetates 64 and 65, served as the precursor leading to the key compound 61 (Scheme 10) [97H(45)1647]. Details of the synthesis of 64 had been given previously by Bergman (82CS193). 

Indol, CgH N, is the mother substance of the indigo group of compounds. It exists in various essential oils including neroli oil and oil of jasmin flowers. It is a crystalline compound, melting at 52° and boiling at 253° to 254°. Its odour is powerful and disagreeable, being distinctly faecal in character. Its constitution is as follows —... 

At the present time we have not attempted to isolate a-thioisatin, the presumed intermediate in the synthesis of indigo. However, it is immediately apparent that if this intermediate could be isolated or intercepted in situ, then many possibilities would open up for the conversion of this compound directly into other indole derivatives. It is also apparent that it should be possible to carry out the reaction with substituted thioureas. We shall be exploring these possibilities. 

Eaton RW, PJ Chapman (1995) Eormation of indigo and related compounds from indolecarboxylic acids by aromatic acid-degrading bacteria chromogenic reactions for cloning genes encoding dioxygenases that act on aromatic acids. J Bacteriol 177 6983-6988. 

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