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Paraffins, waxes and cycloalkanes

Cyclobutane

Also known as Tetramethylene, Cyclobutane [UN2601] [Flammable gas], cyclobutane, tetramethylene

CAS 287-23-0Formula C4H8Molar mass 56.11 g/molEC 206-014-5
GHS signal word: Danger. Pictograms: Flammable, Gas under pressure 5 suppliers listed
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Cyclobutane chemical structure, C4H8, CAS 287-23-0
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless gas
Melting point
-80 °C
Boiling point
13.1 °C
Density
0.7038 AT 0 °C, 0.7125 @ 5 °C
Flash point
<10
HS code
290219
Category
Paraffins, waxes and cycloalkanes
UN number
UN 2601
Illustrative photo, industrial gas cylinders secured with a safety chain in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Cyclobutane?

Plain description, key identifiers and synonyms

Cyclobutane is a member of cyclobutanes and a cycloalkane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
cyclobutane
CAS number
287-23-0 CAS number cross-checkedOther or deprecated CAS: 7236-82-0
EC number
206-014-5
Molecular formula
C4H8
UNII
5X619RB2CY
InChIKey
PMPVIKIVABFJJI-UHFFFAOYSA-N
InChI
InChI=1S/C4H8/c1-2-4-3-1/h1-4H2
SMILES (canonical and isomeric)
C1CCC1

Synonyms

  • Tetramethylene
  • Cyclobutane [UN2601] [Flammable gas]
  • cyclobutane, tetramethylene
  • UN 2601

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

Appearance
Colorless gasexp.
Melting point
-80 °Cexp.
Boiling point
13.1 °Cexp.
Density
0.7038 AT 0 °C, 0.7125 @ 5 °Cexp.
Flash point
<10exp.
Solubility
INSOL IN WATER, FREELY SOL IN ALCOHOL, ACETONEexp.
Vapour pressure
1.18 × 10⁺³ mm Hg @ 25 °Cexp.

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
56.11 g/molcalc.
Exact mass
56.0626 Dacalc.
LogP (octanol/water)
1.56calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
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, C1CCC1

C1CCC1

1 ring, 4 atoms. This chemical is the scaffold itself.

11,927 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS04: Gas under pressure
Gas under pressure
410NFPA 704 rating

Hazard statements

  • H220Extremely flammable gas.
  • H280Contains gas under pressure, may explode if heated.
Precautionary statements (8)
  • P203Obtain, read and follow all safety instructions before use.
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P222Do not allow contact with air.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P377Leaking gas fire: do not extinguish, unless leak can be stopped safely.
  • P381In case of leakage, eliminate all ignition sources.
  • P403Store in a well-ventilated place.
  • P410 + P403Protect from sunlight. Store in a well-ventilated place.
UN number
UN 2601
Transport hazard class
2.1

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

Cyclobutane suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 5 suppliers
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Where suppliers are based

5 suppliers in 2 countries

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Cyclobutane 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

Int in organic synthesis.

How it is made

Distillation of petroleum

Prepd by hydrogenation of cyclobutene in presence of nickel @ 100 °c. By pyrolysis of ether, along with other products. In 39% yield from cyclobutanecarboxylic acid.

Catalytic hydrogenation of cyclobutene

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 Cyclobutane is traded under.

HS 2902.19Indicative HS code

Cyclanes, cyclenes and cycloterpenes, other

World exports in 2024
$979M
+24.3% vs 2023, imports $1B
2019 to 2024
Top exporters
  1. China23.4%
  2. United States20.6%
  3. Germany13.6%
Top importers
  1. India * partner reported9.9%
  2. United States9.8%
  3. South Korea9.5%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Cyclobutane?

Cyclobutane is a member of cyclobutanes and a cycloalkane.

What is the CAS number of Cyclobutane?

The CAS registry number of Cyclobutane is 287-23-0. Other or deprecated CAS numbers: 7236-82-0.

What is the molecular formula and weight of Cyclobutane?

The molecular formula of Cyclobutane is C4H8 and its molar mass is 56.11 g/mol.

What is Cyclobutane used for?

Int in organic synthesis.

Is Cyclobutane hazardous?

Cyclobutane carries the GHS signal word "Danger". Main hazards: extremely flammable gas, contains gas under pressure, may explode if heated. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Cyclobutane?

Cyclobutane is usually classified under HS code 290219 (Cyclanes, cyclenes and cycloterpenes, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Cyclobutane?

CompoundList lists 5 suppliers of Cyclobutane in China and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Cyclobutane?

Suppliers quote Cyclobutane 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 Cyclobutane

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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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