3-Methyl-1-phenyl-2-pyrazoline-5-one
3-Methyl-1-phenyl-2-pyrazoline-5-one (CAS: 89-25-8; Formula: C10H10N2O) is a versatile organic compound with a molecular weight of 174.20 g/mol. This pale yellow crystalline powder serves as a crucial intermediate in chemical synthesis. Its primary applications include its use as a derivatisation reagent in analytical chemistry, particularly for HPLC, and in coupling reactions for dye synthesis. Supplied by Tech Serve Solutions.
- IUPAC
- 5-Methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one
- Synonyms
- 5-Methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one2-Phenyl-3-methyl-5-pyrazolonePhenylmethylpyrazolone

Derivatisation Reagent
This compound is utilised as a derivatisation reagent in analytical chemistry, especially for High-Performance Liquid Chromatography (HPLC) analysis. It facilitates the detection and quantification of various analytes.
Chemical Synthesis Intermediate
It functions as a valuable intermediate in the synthesis of more complex organic molecules. Its structure lends itself to various chemical transformations.
Coupling Agent in Dye Industry
3-Methyl-1-phenyl-2-pyrazoline-5-one is employed in coupling reactions within the dye manufacturing industry. It contributes to the creation of specific colourants.
Analytical Reagent
The compound finds application as a reagent in various analytical procedures, leveraging its chemical properties for detection and measurement.
| Molecular weight | 174.20 |
|---|---|
| Empirical formula | C10H10N2O |
| Assay | 99% |
| Grade | purum |
| Boiling point | 287 °C/265 mmHg(lit.) |
| Melting point | 126-128 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 3-Methyl-1-phenyl-2-pyrazoline-5-one used for?
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3-Methyl-1-phenyl-2-pyrazoline-5-one is used as a derivatisation reagent in analytical chemistry (especially HPLC), as a coupling agent in the dye industry, and as an intermediate in general chemical synthesis.
What is the CAS number and formula for 3-Methyl-1-phenyl-2-pyrazoline-5-one?
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The CAS number is 89-25-8 and the empirical formula is C10H10N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this product in 'purum' grade with an assay of 99%. We do not represent it as USP, BP, EP, or pharmacopoeia grade.
How should 3-Methyl-1-phenyl-2-pyrazoline-5-one be handled?
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Handle with appropriate personal protective equipment: dust mask type N95 (US), eyeshields, and gloves. Avoid breathing dust. Ensure adequate ventilation. This compound is classified as a Warning, causing skin and eye irritation and respiratory tract irritation (H315-H319-H335) and is harmful if swallowed (H302).
How is 3-Methyl-1-phenyl-2-pyrazoline-5-one packed and exported?
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This chemical is carefully packed according to international shipping regulations and exported globally by Tech Serve Solutions.
How can I request a quote or sample for 3-Methyl-1-phenyl-2-pyrazoline-5-one?
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Please contact Tech Serve Solutions directly through our website or by phone to request a quote or a sample.
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