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Heterocyclic compounds

Pyrazole

Also known as 1H-Pyrazole, 1,2-diazole, Pyrazol

CAS 288-13-1Formula C3H4N2Molar mass 68.08 g/molEC 206-017-1
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Harmful or irritant, Serious health hazard 111 suppliers listed
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Pyrazole chemical structure, C3H4N2, CAS 288-13-1
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
288-13-1
Formula
C3H4N2
Molar mass
68.08 g/mol
Physical form
Liquid
HS code
293319
Category
Heterocyclic compounds
Illustrative photo, closed blue steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Pyrazole?

Plain description, key identifiers and synonyms

1H-pyrazole is the 1H-tautomer of pyrazole. It is a conjugate base of a pyrazolium. It is a conjugate acid of a pyrazol-1-ide. It is a tautomer of a 3H-pyrazole and a 4H-pyrazole.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1H-pyrazole
CAS number
288-13-1 CAS number cross-checkedOther or deprecated CAS: 105809-46-9
EC number
206-017-1
Molecular formula
C3H4N2
UNII
3QD5KJZ7ZJ
MDL number
MFCD00005234
InChIKey
WTKZEGDFNFYCGP-UHFFFAOYSA-N
InChI
InChI=1S/C3H4N2/c1-2-4-5-3-1/h1-3H,(H,4,5)
SMILES (canonical and isomeric)
C1=CNN=C1

Synonyms

  • 1H-Pyrazole
  • 1,2-diazole
  • Pyrazol
  • 1H-pyrazol
  • diazole
  • Hpz
  • 2-Pyrromonazole
  • Pyrazole-
  • 3-pyrazole
  • Pyrazole, 98%
  • Pyrazole, purum, >=98.0% (GC)
  • Pyrazole Solution in Methanol, 1000ug/mL

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Liquidexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
68.08 g/molcalc.
Exact mass
68.0374 Dacalc.
LogP (octanol/water)
0.41calc.
Topological polar surface area
28.68 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1cn[nH]c1

c1cn[nH]c1

1 ring, 5 atoms. This chemical is the scaffold itself.

40,521 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H302Harmful if swallowed.
  • H311Toxic in contact with skin.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H372Causes damage to organs through prolonged or repeated exposure.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (26)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Pyrazole suppliers

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All 111 suppliers
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Where suppliers are based

111 suppliers in 15 countries

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Pyrazole price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Industrial uses: Other.

Consumer uses: Etching agent.

Pharmacological actions

  • Enzyme Inhibitors

Pharmacology

Pyrazole is a heterocyclic organic compound characterized by a ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions, with the molecular formula C3H4N2.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Pyrazole is traded under.

HS 2933.19Indicative HS code

Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the…

World exports in 2024
$3.44B
−22.6% vs 2023, imports $6.66B
2019 to 2024
Top exporters
  1. China21.6%
  2. Switzerland * partner reported20.5%
  3. Germany19.0%
Top importers
  1. Slovenia38.4%
  2. Portugal14.1%
  3. Brazil13.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Pyrazole is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Pyrazole, based on the data on this page

What is Pyrazole?

1H-pyrazole is the 1H-tautomer of pyrazole. It is a conjugate base of a pyrazolium. It is a conjugate acid of a pyrazol-1-ide. It is a tautomer of a 3H-pyrazole and a 4H-pyrazole.

What is the CAS number of Pyrazole?

The CAS registry number of Pyrazole is 288-13-1. Other or deprecated CAS numbers: 105809-46-9.

What is the molecular formula and weight of Pyrazole?

The molecular formula of Pyrazole is C3H4N2 and its molar mass is 68.08 g/mol.

What is Pyrazole used for?

Industrial uses: Other. Consumer uses: Etching agent.

Is Pyrazole hazardous?

Pyrazole carries the GHS signal word "Danger". Main hazards: harmful if swallowed, toxic in contact with skin, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyrazole?

Pyrazole is usually classified under HS code 293319 (Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrazole?

CompoundList lists 111 suppliers of Pyrazole in China, United States, United Kingdom, Germany and 11 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Pyrazole in India?

1 supplier in India list Pyrazole on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Pyrazole?

Suppliers quote Pyrazole on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Pyrazole

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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