Indoles dioxindoles

Trichloroethane, Trichloroethylene Dioxanol, see 1,4-Dioxane Dioxanone, see 1,4-Dioxane Dioxindole, see Indole 2,2 -Diphenic acid, see Phenanthrene Diphenyl disulfide, see Fonofos... 

G. A. Russell, C. L. Myers, P. Bruni, F. A. Neugebauer, and R. Blankespoor, Semidiones. X. Semidione radical anions derived from indan-2.3-dione, coumaran-2.3-dione, thianaphthalenequi-none, isatin, and IV-hydroxy isatin. Nitroxide radicals derived from isatin, dioxindole, oxindole, and other indole derivatives, /. Am. Chem. Soc. 92, 2762-2768 (1970). 

Baeyer s most famous researches, on the constitution and synthesis of indigo, began in 1865. Indigo had been investigated by Laurent and by Erdmann, who obtained isatin from it by oxidation (see p. 389). Baeyer showed that isatin on reduction forms dioxindole and then oxindole, which when distilled with zinc dust (a favourite method with Baeyer) is reduced to the parent substance indole ... 

Kekule s formula for isatin has, by mistake, CO=CO). Of dioxindole and oxindole he says The first body is perhaps an aldehyde in oxindole direct linking of carbon has probably occurred. When, finally, indole is produced, the... 

Joseph Martinet first reported the conversion of anilines to dioxindoles upon combination with diethylmesoxalic ester in 1913 while earning a Ph.D. under the direction of A. Haller. He later went on the develop syntheses of indigols as well as develop practical methods for preparing diazo-indole dyes, which have been used industrially. ... 

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