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4-Bromo-1-methyl-1H-pyrazole

Also known as: 1-Methyl-4-bromo-1H-pyrazole, 4-Bromo-1-methylpyrazole, 1-Methyl-4-bromopyrazole, MFCD02179565

4-Bromo-1-methyl-1H-pyrazole (CAS 15803-02-8) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H5BrN2 and a molecular weight of 161.000 g/mol. Key properties include a melting point of 185-188ºC, a boiling point of 197.1±13.0 °C at 760 mmHg, a density of 1.7±0.1 g/cm3 and a flash point of 73.0±19.8 °C. It is classified under GHS with signal word Danger and hazard statements H315 — Causes skin irritation, H318 — Causes serious eye damage and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
15803-02-8
Jingsj CID
J-23505-2
Molecular Formula
C4H5BrN2
Molecular Weight
161.000 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Melting Point185-188ºC
Boiling Point197.1±13.0 °C at 760 mmHg
Density1.7±0.1 g/cm3
Flash Point73.0±19.8 °C
Exact Mass159.963608
PSA17.82000
LogP1.29
Vapor Pressure0.5±0.4 mmHg at 25°C
Refractive Index1.606

GHS Safety & Compliance

Corrosion / IrritantSignal word: Danger
  • H315 — Causes skin irritation
  • H318 — Causes serious eye damage
  • H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of 4-Bromo-1-methyl-1H-pyrazole?

The CAS number of 4-Bromo-1-methyl-1H-pyrazole is 15803-02-8.

What are the molecular formula and molecular weight of 4-Bromo-1-methyl-1H-pyrazole?

4-Bromo-1-methyl-1H-pyrazole has molecular formula C4H5BrN2 and molecular weight 161.000 g/mol.

Is 4-Bromo-1-methyl-1H-pyrazole hazardous?

4-Bromo-1-methyl-1H-pyrazole has GHS signal word Danger and hazard statements H315 — Causes skin irritation; H318 — Causes serious eye damage; H335 — May cause respiratory irritation.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "4-Bromo-1-methyl-1H-pyrazole (CAS 15803-02-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-23505-2 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.