Efficient hydrogenation of o aminonitrobenzenes on palladium containing granulated carbon catalysts in carboxylic acid solutions was accompanied by cyclization into amino benzimidazoles. A simple hydrogenation reactor with a fixed gauze holding a reusable granu lated catalyst was designed. Acylated and sulfonylated 4(7) aminobenzimidazoles were ob tained. In terms of electronic and geometrical parameters, they are close analogs of biologically active imidazo[1,5,4 e, f ][1,5]benzodiazepines.
Complex formation between Al 3+ and iminodisuccinic acid (H 4 L) was studied at 25°C against the background of 0.1, 0.4, 0.6, and 0.8 N solutions of KNO 3 by potentiometry and mathematical modeling. The extrapolation of concentration constants to zero ionic strength was used to calculate the thermodynamic con stants of the formation of the AlL -, AlHL, and AlOHL 2-complexes using an equation with one individual parameter (logβ 0 = 16.48 ± 0.08, 8.93 ± 0.14, and 22.88 ± 0.08, respectively).
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