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Heterocyclic building blocks

Pivalolactone

Also known as Pivalic acid lactone, 3,3-Dimethyl-2-oxetanone, Dimethyl propiolactone

CAS 1955-45-9Formula C5H8O2Molar mass 100.12 g/mol
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Pivalolactone chemical structure, C5H8O2, CAS 1955-45-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
1955-45-9
Formula
C5H8O2
Physical form
Liquid
Solubility
10 to 50 mg/mL at 66 °F (NTP, 1992)
HS code
293220
Category
Heterocyclic building blocks
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Pivalolactone?

Plain description, key identifiers and synonyms

Pivalolactone is a clear colorless liquid. (NTP, 1992)

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3,3-dimethyloxetan-2-one
CAS number
1955-45-9 CAS number cross-checked
Molecular formula
C5H8O2
UNII
6813U5R1GP
InChIKey
ULKFLOVGORAZDI-UHFFFAOYSA-N
InChI
InChI=1S/C5H8O2/c1-5(2)3-7-4(5)6/h3H2,1-2H3
SMILES (canonical and isomeric)
CC1(COC1=O)C

Synonyms

  • Pivalic acid lactone
  • 3,3-Dimethyl-2-oxetanone
  • Dimethyl propiolactone
  • 2-Oxetanone, 3,3-dimethyl-
  • alpha,alpha-Dimethyl-beta-propiolactone
  • 3,3-Dimethyl-2-oxethanone
  • 3,3-Dimethyl-beta-propiolactone
  • Propanoic acid, 3-hydroxy-2,2-dimethyl-, beta-lactone
  • alpha,alpha-Dimethylpropiolactone
  • 5-17-09-00032 (Beilstein Handbook Reference)
  • Hydracrylic acid, 2,2-dimethyl-, beta-lactone
  • alpha, alpha-dimethyl-beta-propiolactone
  • 3,3Dimethyl2oxetanone
  • 2Oxetanone, 3,3dimethyl
  • 3,3Dimethylbetapropiolactone
  • alpha,alphaDimethylbetapropiolactone
  • Propanoic acid, 3hydroxy2,2dimethyl, betalactone
  • 3,3-dimethyloxetan-2-one
  • Pivalolactone.
  • Pivalolactone (in chloroform ~1.6per cent w/v)
  • Pivalolactone (in chloroform ~1.6% w/v)
  • 3,3-Dimethyl-2-oxetanone, 3,3-Dimethyl-?-propiolactone, Pivalic Acid Lactone, ?,?-Dimethyl-?-propiolactone, ?,?-Dimethylpropiolactone,
  • 3,3-dimethyl-oxetan-2-one

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.
Solubility
10 to 50 mg/mL at 66 °F (NTP, 1992)exp.

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
100.12 g/molcalc.
Exact mass
100.0524 Dacalc.
LogP (octanol/water)
0.57calc.
Topological polar surface area
26.3 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
7calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.8calc.
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, O=C1CCO1

O=C1CCO1

1 ring, 5 atoms, the beta-Propiolactone ring system.

185 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Pivalolactone suppliers

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Pivalolactone 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

Chemical intermediate for sulfur-containing pivalic acid derivatives.

How it is made

Abstraction of sodium chloride from sodium salt of monochloropivalic acid

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive 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 Pivalolactone is traded under.

HS 2932.20Indicative HS code

Lactones

World exports in 2024
$1.97B
−4.7% vs 2023, imports $2.07B
2019 to 2024
Top exporters
  1. China56.3%
  2. India * partner reported7.4%
  3. Germany7.3%
Top importers
  1. United States14.2%
  2. India * partner reported13.5%
  3. Brazil8.5%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Pivalolactone?

Pivalolactone is a clear colorless liquid. (NTP, 1992)

What is the CAS number of Pivalolactone?

The CAS registry number of Pivalolactone is 1955-45-9.

What is the molecular formula and weight of Pivalolactone?

The molecular formula of Pivalolactone is C5H8O2 and its molar mass is 100.12 g/mol.

What is Pivalolactone used for?

Chemical intermediate for sulfur-containing pivalic acid derivatives.

Is Pivalolactone hazardous?

No GHS hazard classification for Pivalolactone is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Pivalolactone?

Pivalolactone is usually classified under HS code 293220 (Lactones). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pivalolactone?

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

What is the price of Pivalolactone?

Suppliers quote Pivalolactone 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 Pivalolactone

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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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