No abstract

No abstract

No abstract

No abstract

No abstract

No abstract

The Preparation of 5-Nitro-2-aminophenol and Some Derivatives.-The isatins (I) are oxidized in a Bayer-Villiger oxidation, nitrated and hydrolyzed to give 5-nitro-2-aminophenols (II). Diazotization and coupling of (II) with pyrazolone (III) gives the dye (IV). -(DELIGEORGIEV, T.; ZANEVA, D.; KALCHEVA, V.; SIMOV, D.; Dyes Pigm. 23 (1993) 2, 85-90; Fac. Chem., Univ., 1126 Sofia, Bulg.; EN)

An Improved Method for the Halogenation of 2(3H)-Benzoxazolones.-Mono-, di-, and trihalogenation of the 2(3H)-benzoxazolones (I) is achieved with hydrochloric or hydrobromic acid and hydrogen peroxide in acetic acid. -(KALCHEVA, V. B.; DELIGEORGIEV, T. G.; ZANEVA, D. A.; Dyes Pigm. 15 (1991) 4, 275-278; Univ. Sofia, Fac. Chem., 1126 Sofia, Bulg.; EN)