3-Chloro-5-nitro-1H-indazole(CAS: 4812-45-7)

3-Chloro-5-nitro-1H-indazole is a crystalline solid with a molecular weight of approximately 228.57 g/mol. It is only slightly soluble in water but soluble in common organic solvents like ethanol and acetone. The compound is known for its high reactivity towards nucleophiles and can undergo substitution reactions easily. It is a yellowish to orange crystalline solid at room temperature.

3-Chloro-5-nitro-1H-indazole can be synthesized via the nitration of 3-chloro-1H-indazole followed by the removal of the hydroxyl group. Commonly, this involves refluxing 3-chloro-1H-indazole with nitric acid in the presence of sulfuric acid. The yield of the reaction is typically around 75-85%, with careful control of reaction conditions to achieve high selectivity and purity.

3-Chloro-5-nitro-1H-indazole is primarily used in the pharmaceutical industry as an intermediate for the synthesis of various drugs. It is also utilized in the polymer industry for the production of specific types of polymers, and in the sensor industry for developing gas sensors. Its electronic properties make it a potential candidate for use in semiconductors and optoelectronic devices.

When handling 3-Chloro-5-nitro-1H-indazole, it is essential to use appropriate personal protective equipment (PPE) such as gloves, goggles, and a lab coat. Work should be conducted in a well-ventilated area or fume hood due to its reactive nature. Spills should be cleaned up carefully using appropriate absorbents, and the area should be properly ventilated. Always refer to the Safety Data Sheet (SDS) for specific handling instructions and emergency procedures.