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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

1-Phenyl-3-methyl-5-pyrazolone | CAS 89-25-8

An N-phenyl pyrazolone used in colourant synthesis and as the PMP derivatization reagent for reducing carbohydrates, with qualification priorities that differ between coupling feedstock and analytical labelling material.

CAS89-25-8
Molecular formulaC10H10N2O
Molecular weight174.20 g/mol

Product overview

The pyrazolone ring combines an N-phenyl group, a methyl substituent and a carbonyl-containing reactive system. CAS 89-25-8 identifies the compound commonly abbreviated PMP in carbohydrate analysis. The same molecular structure also appears under the name edaravone, making the intended purchasing use more informative than an alias alone. For colourant manufacture, the relevant review centres on chemical content, related substances and coupling behaviour. Analytical laboratories additionally need a reagent blank and a suitability check in the intended separation method. A visually acceptable powder can still have chromatographic background that matters for a sensitive assay, so the test programme should follow the receiving application.

Chemical identity

Chemical name
1-Phenyl-3-methyl-5-pyrazolone
CAS number
89-25-8
Molecular formula
C10H10N2O
Molecular weight
174.20 g/mol

Application context

1-Phenyl-3-methyl-5-pyrazolone is a coupling component in dye and pigment chemistry. Its substituted heterocycle contributes to the structure of the colourant formed during subsequent reaction; precursor identity and the profile of related pyrazolones are therefore relevant to reproducible synthesis.

A distinct application is derivatization of reducing carbohydrates. PMP-labelled sugar analysis has been described with HPLC, capillary electrophoresis and mass-spectrometric detection. Here, buyers should define the analytical workflow and the required reagent-blank behaviour, alongside chemical assay. Evaluation can compare a representative sugar mixture and a blank under the established method, allowing reagent-related peaks to be assessed against the analyte region. Material intended as a dye intermediate should be qualified separately before use in this analytical setting.

Chemistry and synthetic role

The C4 position participates in the reactive pyrazolone system. This structural feature underlies its use in coupling and carbonyl-related derivatization chemistry; the phenyl group is bound to ring nitrogen.

Quality review

Confirm the substituted pyrazolone

Use identity data that establish N-phenyl and methyl substitution, with separation of relevant related compounds.

Check the analytical blank

For sugar analysis, evaluate reagent-derived peaks using the actual method and detection settings.

Agree a colourant acceptance test

For coupling use, define chemical assay and any comparative colour or reaction-response test required by the buyer.

Preparing a specification

State PMP identity, intended dye or carbohydrate-analysis use, assay method and related-substance requirements. Analytical enquiries should include blank acceptance and method-suitability criteria.

Packaging and storage

Agree the package and closure for the intended sampling practice. Use the selected supplier’s current SDS and label to establish storage conditions.

Documentation

Request COA, SDS and identity records; confirm availability of chromatograms, reagent-blank data or a representative coupling assessment relevant to the use.

Procurement questions

What does PMP refer to here?

1-Phenyl-3-methyl-5-pyrazolone, also named 3-methyl-1-phenyl-2-pyrazolin-5-one.

Is assay alone sufficient for sugar analysis?

A blank and method-suitability check help establish whether reagent-related peaks interfere with the measurement.

Why distinguish colourant and analytical grades?

The same identity can be evaluated against different impurity, blank and performance requirements.

Technical sources
  1. PubChem CAS-resolved identity, CID 4021NCBI / National Library of Medicine
  2. 3-Methyl-1-phenyl-2-pyrazoline-5-one M70800Sigma-Aldrich
  3. Bioassay of 1-phenyl-3-methyl-5-pyrazoloneU.S. National Cancer Institute / Government Publishing Office
  4. Pigment intermediates product portfolioTriumph Chemicals