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Encyclopedia Britannica - Main :: INV-JED |
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ISATIN, C8H5NO2 , in chemistry , a derivative of indol, interesting on account of its relation to indigo; it may be regarded as the anhydride of ortho-aminobenzoylformic or isatinic acid. It crystallizes in orange red prisms which melt at 200-201 C. It may be prepared by oxidizing indigo with nitric or chromic acid (0. L. Erdmann, Jour. prak. Chem., 1841, 24, p. 11); by boiling ortho-nitrophenylpropiolic acid with alkalis (A. Baeyer, Ber., 188o, 13, p. 2259), or by oxidizing carbostyril with alkaline potassium permanganate (P. Friedlander and H. Qstermaier, Ber., 1881, 14, p. 1921). P. J. Meyer (German Patent 26736 (1883)) obtains substituted isatins by condensing para-toluidine with dichloracetic acid, oxidizing the product with air and then hydrolysing the oxidized product with hydrochloric acid. T. Sandmeyer (German Patents 113981 and 119831 (1899)) obtained isatin
hydroxylamine
isatin
II by reduction with ammonium sulphide. Isatin dissolved in concentrated sulphuric acid gives a blue coloration with thiophene, due to the formation of indophenin (see Abst. J.C.S., 1907). Concentrated nitric acid oxidizes it to oxalic acid, and alkali
violet
change due to the transformation of sodium N-isatin into sodium isatate, the aciisatin salt
Heller
ethers
salt
c(co N > co co Cton) NRa.t Iowa* End of Article: ISATIN, C8H5NO2 If you wish, you can link directly to this article.
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