19735-89-8

Basic information

• Product Name: 1,2-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one
• Synonyms: 1,2-dihydro-5-methyl-2-phenyl-3h-pyrazol-3-one;1-PHENYL-3-METHYL-5-PYRAZOLONE;5-Methyl-2-phenyl-1,2-dihydropyrazol-3-one;1-Phenyl-3-methyl-1H-pyrazole-5(2H)-one;2-Phenyl-5-methyl-1,2-dihydro-3H-pyrazole-3-one;2-Phenyl-5-methyl-1H-pyrazole-3(2H)-one;5-Methyl-2-phenyl-1,2-dihydro-3H-pyrazole-3-one;1,2-Dihydro-5-methyl
• CAS NO: 19735-89-8
• Molecular Formula: C₁₀H₁₀N₂O
• Molecular Weight: 174.2
• EINECS: 243-261-8
• Mol File: 19735-89-8.mol
• Article Data: 17

Chemical Properties

• Melting Point: 128°C
• Boiling Point: 305.17°C (rough estimate)
• Flash Point: 120.991 °C
• Appearance: /
• Density: 1.2600
• Vapor Pressure: 0.0048mmHg at 25°C
• Refractive Index: 1.6370 (estimate)
• PKA: 0.10±0.40(Predicted)
• CAS DataBase Reference: 1,2-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one(CAS DataBase Reference)
• NIST Chemistry Reference: 1,2-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one(19735-89-8)
• EPA Substance Registry System: 1,2-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one(19735-89-8)

Safety Data

• Hazardous Substances Data: 19735-89-8(Hazardous Substances Data)

Usage

General Description

1,2-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one is a chemical compound known for its heterocyclic structure, which means it contains atoms of at least two different elements as members of its rings. It falls under the category of pyrazoline, a derivative of azines. It mainly contains carbon, hydrogen, and nitrogen along with one oxygen atom. The properties of this compound, like other chemical compounds, can be altered depending on the positioning and type of the functional group attached to it. This chemical compound is commonly used in chemical research and could serve as a potential bioactive agent.

InChI:InChI=1/C10H10N2O/c1-8-7-10(13)12(11-8)9-5-3-2-4-6-9/h2-7,11H,1H3

Upstream product

• 27349-35-5 5-methoxy-3-methyl-1-phenyl-1H-pyrazole 
• 124559-22-4 3-phenylhydrazono-butyric acid anilide 
• 59-88-1 phenylhydrazine hydrochloride 
• 141-97-9 ethyl acetoacetate 
• 100-63-0 phenylhydrazine 
• 114-83-0 1-acetyl-2-phenylhydrazine 
• 622-84-4 2-formyl-1-phenylhydrazine 
• 102-01-2 N-phenylacetoacetamide 
• 6127-92-0 E-Ethyl β-chlorocrotonate 
• 6127-93-1 3-chlorocrotonic acid ethyl ester 
• 64-17-5 ethanol 
• 6078-46-2 ethyl 3-(2-phenylhydrazono)butanoate 
• 35467-82-4 ethyl 3-(phenylazo)but-2-enoate 
• 103-70-8 Formanilid 

Downstream Products

• 108852-08-0 5-methyl-2-phenyl-4-pyrrol-2-ylmethylene-2,4-dihydro-pyrazol-3-one 
• 109733-46-2 5-methyl-2-phenyl-4-[(4,5,6,7-tetrahydro-benzothiazol-2-ylamino)-methyl]-1,2-dihydro-pyrazol-3-one 
• 103207-52-9 5-methyl-2-phenyl-4-[(4-phenyl-thiazol-2-ylamino)-methyl]-1,2-dihydro-pyrazol-3-one 
• 57784-82-4 4-(1-amino-ethylidene)-5-methyl-2-phenyl-2,4-dihydro-pyrazol-3-one 
• 60-80-0 antipyrine 
• 397878-11-4 5,5'-dimethyl-2,2'-diphenyl-1,2,1',2'-tetrahydro-4,4'-benzylidene-bis-pyrazol-3-one 
• 15900-11-5 (5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-pyrazol-4-ylidene)-methane 
• 172038-40-3 5,5'-dimethyl-2,2'-diphenyl-1,2,1',2'-tetrahydro-4,4'-methanediyl-bis-pyrazol-3-one 
• 103505-79-9 5-methyl-4-[(4-phenethyl-thiazol-2-ylamino)-methyl]-2-phenyl-1,2-dihydro-pyrazol-3-one 
• 16335-66-3 1-phenyl-3-methyl-4-(2-methoxy-phenylhydrazo)-5-pyrazolone 
• 97032-57-0 5-(5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-ylmethylene)-pyrimidine-2,4,6-trione 
• 19205-04-0 5-methyl-2-phenyl-2H-pyrazole-3,4-dione 4-[(3-methyl-3H-benzothiazol-2-ylidene)-hydrazone] 
• 939890-18-3 5-hydroxy-5-(5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-barbituric acid 
• 77035-57-5 5,5'-dimethyl-2,2'-diphenyl-1,2,1',2'-tetrahydro-4,4'-heptylidene-bis-pyrazol-3-one 

Relevant articles and documents

RECYCLIZATION OF 4-METHYL(PHENYL)-2,3-DIHYDRO-1H-1,5-BENZODIAZEPIN-2-ONES

Depending on the reaction conditions, the hydrazinolysis of 4-(acetyl-methylene)-1,2,3,5-tetrahydro-1,5-benzodiazepin-2-one affords N-(2-aminophenyl)-5-methyl-3-pyrazolylacetamide or 2-benzimidazo-5-methyl-3-pyrazolylmethane.In the presence of phenylhydrazine, 3,4,5-trimethyl-1,5-benzodiazepine is recyclized to 3,4,5-trimethyl-1-phenyl-2-pyrazole.

Design and Synthesis of Fused and Spiro Pyrazole Derivatives

Abstract: Condensation of 5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one with p-hydroxybenzaldehyde in alcoholic sodium hydroxide yielded (Z)-4-(4-hydroxybenzylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one which was treated with acetylacetone, hydrazine hydrate, ethyl cyanoacetate, and ethyl acetoacetate to afford pyranopyrazole, pyrazolopyrazole, pyrazolopyridine, and 6-aminopyrazolopyridine derivatives, respectively. 5-Methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one was also reacted at the enamino carbon atom with 2,4-dichlorobenzoyl isothiocyanate, thiosemicarbazide, and hydrazine hydrate to produce pyrazolooxazine, pyrazolopyrazole, and spiro[pyrazole-3,3′-pyrazolo[3,4-c]pyrazole] derivatives.

Synthesis of Pyrano, Pyrido, Oxazino, and Spiro Pyrazole Derivatives and Their Antimicrobial Activity

Abstract: Condensation of 5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one with 4-hydroxybenzaldhyde in alcoholic sodium hydroxide yielded 4-(4-hydroxybenzylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, and treatment of the latter with acetylacetone, hydrazine hydrate, ethyl cyanoacetate, and ethyl acetoacetate gave pyranopyrazole, pyrazolopyrazole, and pyrazolopyridine derivatives. 5-Methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one was reacted with 2,4-dichlorobenzoyl isothiocyanate, thiosemicarbazide, and hydrazine hydrate to afford pyrazolooxazine, pyrazolopyrazole, and spiro[pyrazole-3,3′-pyrazolo[3,4-c]pyrazole] derivatives. Some of the newly synthesized compounds showed high antimicrobial activity against three microbial strains (S. aureus, E. coli, C. albicans).

Efficient Synthesis of Five Types of Heterocyclic Compounds via Intramolecular Elimination Using Ultrasound-Static Heating Technique

An experimental technique, ultrasound-static heating, has been developed for the efficient synthesis of heterocyclic compounds. The technique involves ultrasonic irradiation and static heating processes. First, the ultrasonic irradiation process is performed to form an intermediate of the heterocyclic compound under mild conditions and the subsequent static heating process (heating the intermediate under solvent-free conditions without stirring) produces the target heterocyclic compounds via intramolecular elimination.