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Ethers, epoxides and acetals

Trimethyloxirane

Also known as Trimethylethylene oxide, 2-Methyl-2,3-epoxybutane, beta-Isoamylene oxide

CAS 5076-19-7Formula C5H10OMolar mass 86.13 g/molEC 225-784-3
GHS signal word: Danger. Pictograms: Flammable
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Trimethyloxirane chemical structure, C5H10O, CAS 5076-19-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
5076-19-7
Formula
C5H10O
Molar mass
86.13 g/mol
Physical form
Liquid
HS code
291090
Category
Ethers, epoxides and acetals
Illustrative photo, closed blue steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Trimethyloxirane?

Plain description, key identifiers and synonyms

Trimethyloxirane is a chemical substance with the molecular formula C5H10O and a molar mass of 86.13 g/mol. Its CAS registry number is 5076-19-7. The IUPAC name is 2,2,3-trimethyloxirane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2,2,3-trimethyloxirane
CAS number
5076-19-7 CAS number cross-checked
EC number
225-784-3
Molecular formula
C5H10O
MDL number
MFCD00233698
InChIKey
QPBYBLZYMNWGMO-UHFFFAOYSA-N
InChI
InChI=1S/C5H10O/c1-4-5(2,3)6-4/h4H,1-3H3
SMILES (canonical and isomeric)
CC1C(O1)(C)C

Synonyms

  • Trimethylethylene oxide
  • 2-Methyl-2,3-epoxybutane
  • beta-Isoamylene oxide
  • 2-Methyl-2-butene oxide
  • 2,2,3-Trimethyloxirane
  • Oxirane, trimethyl-
  • 2,3-Epoxy-2-methylbutane
  • Trimethyloxacyclopropane
  • Butane, 2,3-epoxy-2-methyl-
  • Isoamylene oxide
  • 2-Methyl-2,3-butane oxide
  • dimethyl propylene oxide
  • 5-17-01-00089 (Beilstein Handbook Reference)
  • oxirane, 2,2,3-trimethyl-
  • alpha-Trimethylethylene oxide
  • 2,3-Epoxy-2-methylbutane, 97%

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
86.13 g/molcalc.
Exact mass
86.0732 Dacalc.
LogP (octanol/water)
1.18calc.
Topological polar surface area
12.53 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
6calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
1calc.
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, C1CO1

C1CO1

1 ring, 3 atoms, the Ethylene oxide ring system.

3,057 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable

Hazard statements

  • H225Highly flammable 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

Trimethyloxirane suppliers

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Trimethyloxirane 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

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 Trimethyloxirane is traded under.

HS 2910.90Indicative HS code

Epoxides with a three-membered ring and their halogenated, sulphonated, nitrated or nitrosated derivatives…

World exports in 2024
$467M
−2.9% vs 2023, imports $501M
2019 to 2024
Top exporters
  1. Netherlands24.5%
  2. China19.7%
  3. Japan18.8%
Top importers
  1. United States17.6%
  2. Germany16.3%
  3. China10.8%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Trimethyloxirane?

Trimethyloxirane is a chemical substance with the molecular formula C5H10O and a molar mass of 86.13 g/mol. Its CAS registry number is 5076-19-7. The IUPAC name is 2,2,3-trimethyloxirane.

What is the CAS number of Trimethyloxirane?

The CAS registry number of Trimethyloxirane is 5076-19-7.

What is the molecular formula and weight of Trimethyloxirane?

The molecular formula of Trimethyloxirane is C5H10O and its molar mass is 86.13 g/mol.

What is Trimethyloxirane used for?

Known uses and roles of Trimethyloxirane include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Trimethyloxirane hazardous?

Trimethyloxirane carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Trimethyloxirane?

Trimethyloxirane is usually classified under HS code 291090 (Epoxides, epoxyalcohols, epoxyphenols and epoxyethers, with a three-membered ring, and…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Trimethyloxirane?

Post a free request on CompoundList and suppliers of Trimethyloxirane will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Trimethyloxirane?

Suppliers quote Trimethyloxirane 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 Trimethyloxirane

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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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