Singer, Herbert; Shive, Wm. published the artcile< Synthesis of 7-nitroindole>, Electric Literature of 112-63-0, the main research area is .
Heating 2 g. Et pyruvate o-nitrophenylhydrazone in 10 g. polyphosphoric acid on a steam bath with stirring until homogeneous, then heating the mixture in an oil bath 5 min. at 195°, cooling it to 50°, adding 25 cc. H2O, heating it again on a steam bath, extracting the precipitate again with hot water, extracting the aqueous solution with Et2O, and recrystallizing the residue of the washed (NaHCO3) Et2O solution from aqueous EtOH yield 13.4% Et 7-nitro-2-indolecarboxylate (I), m. 92-3°. Warming 100 mg. I a few min. with 10 cc. 10% KOH, adding an equal amount of H2O, and acidifying the filtered solution give 56% free acid (II), pale yellow needles, m. 271-2°. Heating 100 mg. II in 3 cc. quinoline containing a trace of Cu chromite 2 hrs. at 205° with stirring, pouring the mixture into 4 cc. concentrated HCl, extracting it with Et2O, and evaporating the Et2O give 49.5% 7-nitroindole, deep yellow needles, m. 95-6°, λ 232, 364, plateau at 248-50 mμ (EtOH); it gives a deep red color with Kovac reagent.
Journal of Organic Chemistry published new progress about UV and visible spectra. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.
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