1781-33-5

Basic information

• Product Name: 1-Phenyl-3-methyl-4-diazo-1H-pyrazole-5(4H)-one
• Synonyms: 1-Phenyl-3-methyl-4-diazo-1H-pyrazole-5(4H)-one;4-Diazo-3-methyl-1-phenyl-2-pyrazolin-5-one
• CAS NO: 1781-33-5
• Molecular Formula: C₁₀H₈N₄O
• Molecular Weight: 0
• Mol File: 1781-33-5.mol
• Article Data: 4

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 1-Phenyl-3-methyl-4-diazo-1H-pyrazole-5(4H)-one(CAS DataBase Reference)
• NIST Chemistry Reference: 1-Phenyl-3-methyl-4-diazo-1H-pyrazole-5(4H)-one(1781-33-5)
• EPA Substance Registry System: 1-Phenyl-3-methyl-4-diazo-1H-pyrazole-5(4H)-one(1781-33-5)

Safety Data

• Hazardous Substances Data: 1781-33-5(Hazardous Substances Data)

Usage

Appearance

Yellow solid Describes the physical form and color of the compound.

Diazo group

-N=NIndicates the presence of a diazo group, which contributes to its reactivity.

Pyrazole ring

1H-pyrazole-5(4H)-one Specifies the structure containing a pyrazole ring in the compound.

Reagent in organic synthesis

Used in the preparation of various organic molecules Highlights its common application in organic chemistry.

Employed in synthesis of pharmaceuticals, agrochemicals, and dyes

Mentions its use in creating different products.

High reactivity

Due to its diazo group Explains the reason for its high reactivity.

Handling precautions

Should be handled with caution Advises on the need for careful handling.

Potentially explosive

States the potential risk associated with the compound.

Controlled environment and trained professionals

Emphasizes the importance of handling by experts in a controlled setting.

InChI:InChI=1/C10H9N4O/c1-7-9(12-11)10(15)14(13-7)8-5-3-2-4-6-8/h2-6,11H,1H3/q+1

Upstream product

• 89-25-8 edaravone 
• 2009-97-4 ethyl 2-diazo-3-oxobutanoate 
• 100-63-0 phenylhydrazine 
• 59-88-1 phenylhydrazine hydrochloride 

Downstream Products

• 49714-90-1 3-phenyl-isoxazole-4,5-dione 4-[(5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-hydrazone] 
• 35467-82-4 ethyl (Z)-3-phenylazo-2-butenoate 
• 35467-82-4 ethyl (E)-3-phenylazo-2-butenoate 
• 84752-16-9 methyl 7-oxo-4-methyl-2,6-diphenyl-6H-pyrazolo<1,5-d><1,2,4>triazin-3-carboxylate 
• 84752-19-2 methyl spiro<3-methyl-1-phenylpyrazolin-5-one-4,1'-cyclopropane>-2'-carboxylate 
• 82937-08-4 methyl 3-methyl-1-phenyl-1H-furo<2,3-c>pyrazole-5-carboxylate 
• 82937-09-5 methyl 7-oxo-4-methyl-6-phenyl-6H-pyrazolo<1,5-d><1,2,4>triazin-3-carboxylate 
• 109809-19-0 4-((4-methoxyphenyl)diazenyl)-3-methyl-1-phenyl-1H-pyrazol-5-ol 
• 137514-72-8 3-methyl-4-(naphthalen-1-yldiazenyl)-1-phenyl-1H-pyrazol-5-ol 

Relevant articles and documents

Catalytic System-Controlled Divergent Reaction Strategies for the Construction of Diversified Spiropyrazolone Skeletons from Pyrazolidinones and Diazopyrazolones

A catalytic system-controlled divergent reaction strategy was here reported to construct four types of intriguing spiroheterocyclic skeletons from simple and readily available starting materials via a precise chemical bond activation/[n+1] annulation cascade. The tetraazaspiroheterocyclic and trizazspiroheterocyclic scaffolds could be independently constructed by a selective N?N bond activation/[n+1] annulation cascade, a C(sp2)-H activation/[4+1] annulation and a novel tandem C(sp2)-H/C(sp3)?H bond activation/[4+1] annulation strategy, along with a broad scope of substrates, moderate to excellent yields and valuable transformations. More importantly, in these transformations, we are the first time to capture a N?N bond activation and a C(sp3)?H bond activation of pyrazolidinones under different catalytic system.

Reactive intermediates in the photochemistry of 4-diazo-2-pyrazolin-5-ones

Photolysis of 4-diazo-2-pyrazolin-5-ones in methanol gives a mixture of stereoisomeric methyl 3-aryl-(or alkyl-)azo-2-alkenoates.A study of the absorption spectra of the species generated upon steady-state photolyses in glasses at 77 K, in solution at 296