2-Amino-3-benzyloxypyridine CAS 24016-03-3 Heterocycle series; Dye intermediates; Organic raw materials;
2-Amino-5-fluorobenzoic acid CAS 446-08-2 is a very important precursor for the synthesis of pharmaceuticals, herbicides, plant growth regulators and fungicides of the quinoline type.
2-Chloro-4-nitrobenzoic acid CAS 99-60-5 White or pale yellow needle or powder crystal. Melting point 142-143°C (139-141°C). Soluble in hot water, alcohol and hot benzene.
4-Amino-3-nitrobenzoic acid CAS 1588-83-6 used as dye intermediate
2-Amino-5-nitropyridine CAS 4214-76-0 is derived from the nitration of 2-aminopyridine. At a temperature of 50 °C, 2-aminopyridine was added to concentrated sulfuric acid, and then fuming nitric acid was added dropwise, and the temperature did not exceed 50 °C. Incubate at 45°C for 2h, and stir at room temperature for 4h. The reaction solution was poured into crushed ice, and the pH was adjusted to 6 by adding ammonia water below 5°C, and crystals were precipitated. Filter and dry. Recrystallization with water to obtain pale yellow platelets, yield 75%
2-Hydroxy-5-nitropyridine CAS 5418-51-9 Yellow needle crystals. Melting point 184-187°C (188-191°C). Soluble in hot water and alkaline solution, insoluble in general organic solvents.
