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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

1-Methyl-3-(trifluoromethyl)-1H-pyrazol-5-ol | CAS 122431-37-2

A fluorinated oxygen-functional pyrazole appearing before O-difluoromethylation in a published pyroxasulfone route, where tautomer-aware identity review and separation of genuine ring-position isomers are essential to a useful purchasing specification.

CAS122431-37-2
Molecular formulaC5H5F3N2O
Molecular weight166.10 g/mol

Product overview

This N-methylpyrazole combines a trifluoromethyl substituent with an oxygen-bearing ring position used in pyroxasulfone intermediate chemistry. The hydroxy-named precursor enters published routes before introduction of the difluoromethoxy group. Hydroxy and oxo representations should be compared using a shared structural reference when qualifying identity. The purchasing specification should define the N-methyl and CF3 substitution pattern, quantitative content and the method used to distinguish constitutional isomers. For subsequent conversion at the oxygen-bearing site, agree the water and solvent requirements with the receiving process.

Chemical identity

Chemical name
1-methyl-3-(trifluoromethyl)-1H-pyrazol-5-ol
CAS number
122431-37-2
Molecular formula
C5H5F3N2O
Molecular weight
166.10 g/mol

Application context

Published pyroxasulfone synthesis uses this oxygen-functional pyrazole before introduction of a difluoromethoxy group and further fragment assembly. The hydroxy-stage precursor and later difluoromethoxy derivative need separate material specifications. Agree the reference structure, spectra and chromatographic method together. Related-substance testing should distinguish genuine positional impurities, while quantitative assay and chromatographic area purity are reported on clearly defined bases.

Chemistry and synthetic role

The cited transformation functionalizes the oxygen-bearing pyrazole site. The CF3-bearing position and N-methyl attachment must remain correctly assigned when comparing hydroxy and oxo naming conventions.

Quality review

Reconcile tautomer identifiers

Review the structures behind the supplier and database keys; do not accept or reject a lot solely because a tautomer depiction changes an identifier.

Resolve actual ring-position isomers

Agree structural and chromatographic discrimination of constitutional isomers, distinct from hydroxy/oxo representations.

Confirm the pre-difluoromethylation stage

Distinguish the oxygen-functional starting intermediate from its difluoromethoxy derivative and agree an assay basis for the intended step.

Preparing a specification

Provide CAS, the intended N-methyl/CF3 substitution pattern and a reference drawing with tautomer annotation. Agree assay, isomer separation and any water or solvent criteria for the receiving oxygen-functionalization step.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, order quantity and destination. Request the applicable SDS and label to establish storage and handling conditions.

Documentation

Request the proposed specification, batch COA and current SDS. Confirm availability of the identity data and analytical methods relevant to the checks above; documents depend on the selected manufacturer and grade.

Procurement questions

How should hydroxy and oxo representations be compared?

Use an agreed structural reference and supporting identity data to distinguish tautomeric representations from genuine constitutional isomers.

Is a tautomer drawing a confirmed impurity?

No. Genuine positional impurities require separate structural and analytical evidence.

Is this the difluoromethoxy intermediate?

No. It precedes that oxygen-functionalization step in the cited route.

Technical sources
  1. PubChem CID 1238616 — identity property recordNCBI / PubChem
  2. 5-Hydroxy-1-methyl-3-(trifluoromethyl)pyrazole 711527Sigma-Aldrich
  3. WO2024209278A1 — A process for the preparation of pyroxasulfoneWIPO