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Heterocyclic compounds

2-Pyrazoline

Also known as 4,5-Dihydro-1H-pyrazole, 1H-Pyrazole, 4,5-dihydro-, 4,5-dihydropyrazole

CAS 109-98-8Formula C3H6N2Molar mass 70.10 g/molEC 203-725-2
GHS signal word: Warning. Pictograms: Flammable 1 supplier listed
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2-Pyrazoline chemical structure, C3H6N2, CAS 109-98-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
109-98-8
Formula
C3H6N2
Molar mass
70.10 g/mol
Physical form
Liquid
HS code
293319
Category
Heterocyclic compounds
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is 2-Pyrazoline?

Plain description, key identifiers and synonyms

2-Pyrazoline is a chemical substance with the molecular formula C3H6N2 and a molar mass of 70.10 g/mol. Its CAS registry number is 109-98-8. The IUPAC name is 4,5-dihydro-1H-pyrazole.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4,5-dihydro-1H-pyrazole
CAS number
109-98-8 CAS number cross-checkedOther or deprecated CAS: 36118-45-3
EC numbers
203-725-2, 252-878-1
Molecular formula
C3H6N2
UNII
W1YN47L98V
MDL number
MFCD00059715
InChIKey
MCGBIXXDQFWVDW-UHFFFAOYSA-N
InChI
InChI=1S/C3H6N2/c1-2-4-5-3-1/h2,5H,1,3H2
SMILES (canonical and isomeric)
C1CNN=C1

Synonyms

  • 4,5-Dihydro-1H-pyrazole
  • 1H-Pyrazole, 4,5-dihydro-
  • 4,5-dihydropyrazole
  • delta2-pyrazoline
  • Pyrazole, dihydro-
  • pyrazole, 4,5-dihydro-
  • 4,5-Dihydro-1H-pyrazole, AldrichCPR

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
70.10 g/molcalc.
Exact mass
70.0531 Dacalc.
LogP (octanol/water)
-0.03calc.
Topological polar surface area
24.39 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.67calc.
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, C1=NNCC1

C1=NNCC1

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

191 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS02: Flammable
Flammable

Hazard statements

  • H226Flammable liquid and vapour.
Precautionary statements (11)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • 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

2-Pyrazoline suppliers

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Where suppliers are based

1 supplier in 1 country

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2-Pyrazoline price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 2-Pyrazoline 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 2-Pyrazoline is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2-Pyrazoline, based on the data on this page

What is 2-Pyrazoline?

2-Pyrazoline is a chemical substance with the molecular formula C3H6N2 and a molar mass of 70.10 g/mol. Its CAS registry number is 109-98-8. The IUPAC name is 4,5-dihydro-1H-pyrazole.

What is the CAS number of 2-Pyrazoline?

The CAS registry number of 2-Pyrazoline is 109-98-8. Other or deprecated CAS numbers: 36118-45-3.

What is the molecular formula and weight of 2-Pyrazoline?

The molecular formula of 2-Pyrazoline is C3H6N2 and its molar mass is 70.10 g/mol.

Is 2-Pyrazoline hazardous?

2-Pyrazoline carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Pyrazoline?

2-Pyrazoline 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 2-Pyrazoline?

CompoundList lists 1 supplier of 2-Pyrazoline in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 2-Pyrazoline?

Suppliers quote 2-Pyrazoline 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 2-Pyrazoline

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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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