1122-04-9

Basic information

• Product Name: 3,5-dimethyl-4-nitroso-1H-pyrazole
• Synonyms: 1H-pyrazole, 3,5-dimethyl-4-nitroso-; 3,5-Dimethyl-4-nitroso-1H-pyrazole
• CAS NO: 1122-04-9
• Molecular Formula: C₅H₇N₃O
• Molecular Weight: 125.1286
• Mol File: 1122-04-9.mol
• Article Data: 3

Chemical Properties

• Boiling Point: 336.5°C at 760 mmHg
• Flash Point: 157.3°C
• Density: 1.33g/cm³
• Vapor Pressure: 0.000217mmHg at 25°C
• Refractive Index: 1.612
• CAS DataBase Reference: 3,5-dimethyl-4-nitroso-1H-pyrazole(CAS DataBase Reference)
• NIST Chemistry Reference: 3,5-dimethyl-4-nitroso-1H-pyrazole(1122-04-9)
• EPA Substance Registry System: 3,5-dimethyl-4-nitroso-1H-pyrazole(1122-04-9)

Safety Data

• Hazardous Substances Data: 1122-04-9(Hazardous Substances Data)

Upstream product

• 14531-55-6 3,5-dimethyl-4-nitro-1H-pyrazole 
• 302-01-2 hydrazine 
• 29917-12-2 Isonitrosoacetylacetone 
• 123-54-6 acetylacetone 

Downstream Products

• 161155-32-4 1H,4H-3-carboxy-6-nitropyrazolo<4,3-c>pyrazole 
• 14531-55-6 3,5-dimethyl-4-nitro-1H-pyrazole 
• 5272-86-6 4-amino-3,5-dimethyl-1H-pyrazole 
• 67523-68-6 4-(3,5-dimethyl-1H-pyrazol-4-ylimino)-3-phenyl-4H-isoxazol-5-one 
• 5272-96-8 4,4'-azobis(3,5-dimethyl-1H-pyrazole) 

Relevant articles and documents

Studies in nitrosopyrazoles. Part 1. Preparative and spectroscopic studies of some 3,5-dialkyl-4-nitrosopyrazoles

The preparations of a number of 3,5-disubstituted- and 1,3,5-trisubstituted-4-nitrosopyrazoles are described and a range of physical properties of these compounds are measured. Comparison is made with some 2,6-disubstituted nitrosobenzenes and it is shown from 13C NMR spectroscopy that the effects of substitution by flanking tert-butyl groups are moderated in the case of the pyrazoles from those in the aromatic C6 ring due to a lessening of steric hindrance. It is also suggested that steric effects are evident in the preparation of 1,3,5-substituted-4-nitrosopyrazoles when one of the flanking groups to the NO is tert-butyl or phenyl, there being no such effect for the corresponding case of the isobutyl group.

Thermally stable 3,6-dinitropyrazolo[4,3-c]pyrazole-based energetic materials

3,6-Dinitropyrazolo[4,3-c]pyrazole was prepared using an efficient modified process. With selected cations, ten nitrogen-rich energetic salts and three metal salts were synthesized in high yield based on the 3,6-dinitropyrazolo[4,3-c]pyrazolate anion. These compounds were fully characterized by IR and multinuclear NMR spectroscopies, as well as elemental analyses. The structures of the neutral compounds 4 and its salt 16 were confirmed by single-crystal X-ray diffraction showing extensive hydrogen-bonding interactions. The neutral pyrazole precursor and its salts are remarkably thermally stable. Based on the calculated heats of formation and measured densities, detonation pressures (22.5-35.4 GPa) and velocities (7948-9005 ms-1) were determined, and they compare favorably with those of TNT and RDX. Their impact and friction sensitivities range from 12 to >40 J and 80 to 360 N, respectively. These properties make them competitive as insensitive and thermally stable highenergy density materials.