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Heterocyclic building blocks

Paraldehyde

Also known as 2,4,6-Trimethyl-1,3,5-trioxane, Paracetaldehyde, Paral

CAS 123-63-7Formula C6H12O3Molar mass 132.16 g/molEC 204-639-8
GHS signal word: Warning. Pictograms: Flammable 23 suppliers listed
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Paraldehyde chemical structure, C6H12O3, CAS 123-63-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless, transparent liquid
Melting point
12.6 °C
Boiling point
124.5 °C
Density
0.99 g/cm³
Flash point
35.6 °C
HS code
291250
Category
Heterocyclic building blocks
UN number
UN 1264
Illustrative photo, clear colourless liquid in a glass reagent bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Paraldehyde?

Plain description, key identifiers and synonyms

Paraldehyde is a trioxane that is 1,3,5-trioxane substituted by methyl groups at positions 2, 4 and 6. It has a role as a sedative.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2,4,6-trimethyl-1,3,5-trioxane
CAS number
123-63-7 CAS number cross-checkedOther or deprecated CAS: 1499-02-1
EC number
204-639-8
Molecular formula
C6H12O3
UNII
S6M3YBG8QA
MDL number
MFCD00036208
InChIKey
SQYNKIJPMDEDEG-UHFFFAOYSA-N
InChI
InChI=1S/C6H12O3/c1-4-7-5(2)9-6(3)8-4/h4-6H,1-3H3
SMILES (canonical and isomeric)
CC1OC(OC(O1)C)C

Synonyms

  • 2,4,6-Trimethyl-1,3,5-trioxane
  • Paracetaldehyde
  • Paral
  • Paraldehyd
  • Paraacetaldehyde
  • Triacetaldehyde
  • Elaldehyde
  • Paraldeide
  • p-Acetaldehyde
  • 1,3,5-Trioxane, 2,4,6-trimethyl-
  • Acetaldehyde, trimer
  • 1,3,5-Trimethyl-2,4,6-trioxane
  • 2,4,6-Trimethyl-1,3,5-trioxacyclohexane
  • Paraldehyde Enema (BPC 1973)
  • Paraldehyde (USP)
  • Paraldehyde Draught (BPC 1973)
  • 2,4,6-Trimethyl-1,3,5-trioxaan
  • 2,4,6-Trimetil-1,3,5-triossano
  • Acetaldehyde trimer
  • 2,4,6-Trimethyl-s-trioxane
  • s-Trimethyltrioxymethylene
  • RCRA waste number U182
  • Trimethyl trioxane
  • cis-2,4,6-Trimethyl-1,3,5-trioxane
  • Paral (TN)
Show all 31 synonyms
  • s-Trioxane, 2,4,6-trimethyl-
  • 2,4,6-Trimethyl-1,3,5-trioxan
  • RCRA waste no. U182
  • Paraldehyde civ
  • DEA No. 2585
  • Paraldehyde, 2,4,6-Trimethyl-1,3,5-trioxane, cyclic trimer of acetaldehyde

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, transparent liquidexp.
Odour
CHARACTERISTIC AROMATIC ODORexp.
Taste
DISAGREEABLE TASTEexp.
Melting point
12.6 °Cexp.
Boiling point
124.5 °Cexp.
Density
0.99 g/cm³exp.
Flash point
35.6 °Cexp.
Autoignition temperature
235 °Cexp.
Solubility
SOL IN 8 PARTS WATER AT 25 °C, 17 PARTS BOILING WATERexp.
Vapour pressure
25.3 mm Hg at 20 °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
132.16 g/molcalc.
Exact mass
132.0786 Dacalc.
LogP (octanol/water)
1.09calc.
Topological polar surface area
27.69 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
9calc.
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, C1OCOCO1

C1OCOCO1

1 ring, 6 atoms, the 1,3,5-Trioxane ring system.

33 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS02: Flammable
Flammable
321NFPA 704 rating

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.
UN number
UN 1264
Transport hazard class
3
Packing group
III

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

Paraldehyde suppliers

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All 23 suppliers
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Where suppliers are based

23 suppliers in 7 countries

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Paraldehyde 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

Substitute for acetaldehyde, manufacture dyestuff intermediates, solvent for fats, oils, waxes, gums, resins, leather, mixtures for cellulose derivatives.

Manufacture organic compounds.

Industrially it has been used as solvent & also as rubber activator & antioxidant.

Used in chemical synthesis as a source of acetaldehyde whereby resin formation and other secondary reactions are largely eliminated. ... for instance, ... production of pyridines and chlorination of chloral.

Use classes: Pesticide transformation products.

Pharmacological actions

  • Anticonvulsants
  • Hypnotics and Sedatives

Roles

  • central nervous system depressant
  • central nervous system drug
  • pharmaceutical
  • sedative

Functional uses

  • Flavouring and nutrient
  • Fragrance

How it is made

Prepd by polymerization of acetaldehyde catalyzed by hcl & h2so4 at medium to high temp. Catalyzed by mixture of h2so4 & h3po4.

By treating acetaldehyde with small quantities of sulfur dioxide, hydrochloric acid, carbonyl chloride, or zinc chloride, almost complete conversion occurs, & by freezing liq & then distilling crystallized material, if necessary, pure paraldehyde is produced.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 605-004-00-1

Controls

  • US DEA controlled substance or listed chemical

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Proposed significant new use rule

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2912.50Indicative HS code

Cyclic polymers of aldehydes

World exports in 2024
$34.7M
+37.5% vs 2023, imports $42.7M
2019 to 2024
Top exporters
  1. Switzerland * partner reported38.5%
  2. China28.6%
  3. Germany18.7%
Top importers
  1. Sweden22.3%
  2. Germany14.1%
  3. Vietnam * partner reported12.7%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Paraldehyde?

Paraldehyde is a trioxane that is 1,3,5-trioxane substituted by methyl groups at positions 2, 4 and 6. It has a role as a sedative.

What is the CAS number of Paraldehyde?

The CAS registry number of Paraldehyde is 123-63-7. Other or deprecated CAS numbers: 1499-02-1.

What is the molecular formula and weight of Paraldehyde?

The molecular formula of Paraldehyde is C6H12O3 and its molar mass is 132.16 g/mol.

What is Paraldehyde used for?

Substitute for acetaldehyde, manufacture dyestuff intermediates, solvent for fats, oils, waxes, gums, resins, leather, mixtures for cellulose derivatives. Manufacture organic compounds. Industrially it has been used as solvent & also as rubber activator & antioxidant.

Is Paraldehyde hazardous?

Paraldehyde 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 Paraldehyde?

Paraldehyde is usually classified under HS code 291250 (Cyclic polymers of aldehydes). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Paraldehyde?

CompoundList lists 23 suppliers of Paraldehyde in China, United States, Canada, Germany and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Paraldehyde in India?

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

What is the price of Paraldehyde?

Suppliers quote Paraldehyde 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 Paraldehyde

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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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