1-(3-Sulfophenyl)-3-methyl-2-pyrazolin-5-one
1-(3-Sulfophenyl)-3-methyl-2-pyrazolin-5-one (CAS 119-17-5; C10H10N2O4S; molar mass 254.26 g/mol) is a water-soluble sulphonated pyrazolone building block, supplied as a crystalline solid of approximately 95% assay. The molecule combines a 3-methyl-5-pyrazolone ring with a meta-sulphophenyl group, giving an active methylene centre well suited to condensation and azo coupling. It is used principally as a heterocyclic intermediate in dye and fine-chemical synthesis. Tech Serve Solutions supplies it for research and manufacturing.
- IUPAC
- 1-(3-Sulfophenyl)-3-methyl-5-pyrazolone,3-(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulfonic acid
- Synonyms
- 1-(3-Sulfophenyl)-3-methyl-2-pyrazolin-5-one1-(3-Sulfophenyl)-3-methyl-5-pyrazolone3-(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulfonic acid3-methyl-1-(3-sulfophenyl)-2-pyrazolin-5-oneCAS 119-17-5
Pyrazolone building block for organic synthesis
The reactive 5-pyrazolone ring carries an active methylene group that participates readily in condensation, coupling and heterocyclic ring-forming reactions. It serves as a versatile C10 intermediate in the preparation of more elaborate pyrazole and pyrazolone derivatives.
Coupling component for azo and pyrazolone dyes
Sulphonated 3-methyl-5-pyrazolones are classical coupling components in azo dye chemistry, reacting with diazonium salts to give coloured pyrazolone azo dyes. The pendant sulphonic acid group confers water solubility, supporting use in dye and pigment intermediate manufacture.
Heterocyclic intermediate for fine chemicals
As a defined pyrazole building block, it is used in chemical synthesis programmes to introduce the methyl-pyrazolone and aryl-sulphonic acid motifs. It is suited to exploratory and scale-up work where a water-soluble pyrazolone scaffold is required.
Laboratory reagent and reference material
Supplied at around 95% assay with defined identifiers (MDL MFCD00043811, EC 204-303-0), it is suitable for use as a research-grade reagent and for method development in analytical and synthetic laboratories.
| Molecular weight | 254.26 |
|---|---|
| Empirical formula | C10H10N2O4S |
| Assay | 95% |
| Melting point | 335 °C(lit.) |
Hazard statements
- H317May cause an allergic skin reaction
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 43 |
| Safety statements (S) | 36/37 |
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 1-(3-Sulfophenyl)-3-methyl-2-pyrazolin-5-one used for?
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It is used mainly as a sulphonated pyrazolone building block in organic and fine-chemical synthesis. Its active methylene 5-pyrazolone ring makes it a useful coupling component for azo and pyrazolone dyes and a versatile heterocyclic intermediate for preparing related pyrazole derivatives.
What is the CAS number and molecular formula of 1-(3-Sulfophenyl)-3-methyl-2-pyrazolin-5-one?
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The CAS number is 119-17-5 and the molecular formula is C10H10N2O4S, with a molecular weight of 254.26 g/mol. Its EC number is 204-303-0 and its MDL number is MFCD00043811.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this material as a research and manufacturing grade with a typical assay of about 95%. We do not represent it as USP, BP or EP pharmacopoeia grade; a Certificate of Analysis accompanies each batch and specifications can be confirmed against your requirements before despatch.
What are the safety and handling precautions for this compound?
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It is classified under GHS07 with the signal word Warning and hazard statement H317 (may cause an allergic skin reaction). Avoid skin contact and breathing dust; wear protective gloves, eye and face protection and a dust mask (P280). It carries German Water Hazard Class WGK 1. Always consult the Safety Data Sheet before use.
How is 1-(3-Sulfophenyl)-3-methyl-2-pyrazolin-5-one packed, shipped and exported?
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It is packed as a solid in sealed, labelled containers sized from laboratory quantities to bulk, with packaging chosen to protect the material in transit. Tech Serve Solutions exports worldwide with full documentation, including a Certificate of Analysis and Safety Data Sheet; packaging and shipping mode are confirmed at the time of order.
How do I request a sample or quote?
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Contact Tech Serve Solutions with your required quantity, grade and destination, and our team will respond with availability, lead time and a formal quotation. Samples can be arranged on request to support your evaluation and qualification.
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