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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

3-Methylpyrazole | CAS 1453-58-3

An N–H pyrazole with a carbon-bound methyl group, documented in nitrification-inhibitor studies and formulation patents, where tautomeric naming, free-compound versus salt identity and active-content calculations deserve explicit treatment.

CAS1453-58-3
Molecular formulaC4H6N2

Product overview

The methyl group in 3-methylpyrazole is attached to ring carbon, leaving an N–H group available for further chemistry. This connectivity distinguishes it from 1-methylpyrazole despite their identical elemental formula. The names 3-methylpyrazole and 3(5)-methylpyrazole reflect tautomeric naming of the free N–H compound. It has been investigated as a nitrification inhibitor in fertilizer-treatment formulations. Material selection should distinguish the free compound from salts, metal complexes and formulated additives, and establish the active-content basis used to compare trial batches.

Chemical identity

Chemical name
3-Methylpyrazole
CAS number
1453-58-3
Molecular formula
C4H6N2

Application context

3-Methylpyrazole has been studied in fertilizer-related formulations for nitrification inhibition, including comparisons with other pyrazoles. Formulation development requires a defined chemical form and active content so that different trial batches can be compared on the same basis. Water and any diluent contribution should be included in that calculation. Where a proposed system uses a salt or derivative, specify it separately from the free pyrazole. Assess compatibility and performance in the selected fertilizer matrix, with use requirements established for the finished formulation and intended market.

Chemistry and synthetic role

A proton can be represented on either ring nitrogen in the parent tautomeric system, giving rise to the 3(5) naming convention. Moving the methyl group onto nitrogen changes connectivity; N-substituted downstream derivatives may also require their own positional identification.

Quality review

Distinguish carbon-methyl and N-methyl forms

Use structure-sensitive identity evidence; molecular formula alone cannot separate 3-methylpyrazole from 1-methylpyrazole.

Measure water independently of GC purity

A GC area percentage need not equal the active mass fraction of a wet or diluted sample. Define both reporting bases for formulation work.

Specify the free compound or derivative

Identify any counterion, metal or carrier. Salt and complex composition must be included in active-content calculations.

Preparing a specification

State free 3-methylpyrazole, CAS 1453-58-3, identity and assay methods, water and relevant methylpyrazole impurities. If a fertilizer formulation is intended, distinguish raw-reagent content from the final formulation’s active-content specification.

Packaging and storage

Packaging format, closure and net weight should be agreed for the selected grade, order quantity and destination. Request the actual supplier SDS and confirm its storage and transport instructions before receipt.

Documentation

Request COA, SDS, identity results and the assay and water methods. If assessing a salt or formulated alternative, request its composition and the manufacturer’s supporting data for the intended fertilizer application.

Procurement questions

Are 3- and 5-methyl names always different products?

For this N–H parent, 3(5) naming reflects tautomerism. N-substituted derivatives require their own structural assessment.

Is 1-methylpyrazole equivalent?

No. Its methyl group is attached to nitrogen, giving different connectivity.

How should trial formulations be compared?

Use the same active-content basis, account for water and diluents, and evaluate performance in the selected fertilizer matrix.

Technical sources
  1. PubChem CID 15073NCBI / PubChem
  2. 3-Methylpyrazole M75802Sigma-Aldrich
  3. US6802882B2 — Nitrification inhibitors and treatment of inorganic fertilizersPublished patent via Google Patents
  4. 3-Methyl-1H-pyrazole L01618.14Thermo Fisher Scientific
  5. 3-Methylpyrazole 90299 analytical standardSigma-Aldrich