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Halogenated compounds

Allyl iodide

Also known as 3-Iodo-1-propene, 3-Iodopropene, 1-Propene, 3-iodo-

CAS 556-56-9Formula C3H5IMolar mass 167.98 g/molEC 209-130-4
GHS signal word: Danger. Pictograms: Flammable, Corrosive 9 suppliers listed
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Allyl iodide chemical structure, C3H5I, CAS 556-56-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
556-56-9
Formula
C3H5I
Physical form
Liquid
HS code
290369
Category
Halogenated compounds
UN number
UN 1723
Illustrative photo, 200 litre blue HDPE drums of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Allyl iodide?

Plain description, key identifiers and synonyms

Allyl iodide appears as a yellow liquid with a pungent odor. Denser than water and insoluble in water. Hence sinks in water. Vapors are heavier than air. Very irritating to skin, eyes and mucous membranes. Poisonous by ingestion and inhalation. Used to make other chemicals.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-iodoprop-1-ene
CAS number
556-56-9 CAS number cross-checked
EC number
209-130-4
Molecular formula
C3H5I
UNII
46830QOA4D
MDL number
MFCD00001094
InChIKey
HFEHLDPGIKPNKL-UHFFFAOYSA-N
InChI
InChI=1S/C3H5I/c1-2-3-4/h2H,1,3H2
SMILES (canonical and isomeric)
C=CCI

Synonyms

  • 3-Iodo-1-propene
  • 3-Iodopropene
  • 1-Propene, 3-iodo-
  • 3-Iodopropylene
  • Propene, 3-iodo-
  • 2-Propene, 1-iodo
  • CH2CHCH2I
  • 4-01-00-00761 (Beilstein Handbook Reference)
  • UN 1723
  • 2-propenyl iodide
  • 3Iodopropylene
  • 3Iodopropene
  • 3Iodo1propene
  • 2Propenyl iodide
  • Propene, 3iodo
  • 1Propene, 3iodo
  • 3-iodoprop-1-ene
  • Allyliodide
  • 3-iodo-propene
  • 3-iodo-prop-1-ene
  • Allyl iodide, 98%
  • Allyl iodide [UN1723] [Flammable liquid]
  • Allyl iodide, stabilized with copper
  • Allyl iodide (stabilised with Copper)
  • Allyl Iodide - stabilized with Copper
Show all 26 synonyms
  • 3-Iodopropene (stabilized with copper)

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
167.98 g/molcalc.
Exact mass
167.9436 Dacalc.
LogP (octanol/water)
1.61calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
4calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.33calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H314Causes severe skin burns and eye damage.
Precautionary statements (21)
  • 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.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1723
Transport hazard class
3
Packing group
II

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

Allyl iodide suppliers

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

All 9 suppliers
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Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

9 suppliers in 5 countries

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Allyl iodide price

Indicative price range per kg from live supplier offers

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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

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 602-054-00-6

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 Allyl iodide is traded under.

HS 2903.69Indicative HS code

Brominated or iodinated derivatives of acyclic hydrocarbons, other

World exports in 2024
$135M
−18.6% vs 2023, imports $139M
2022 to 2024
Top exporters
  1. China26.7%
  2. United States26.3%
  3. Netherlands12.3%
Top importers
  1. United States13.2%
  2. India * partner reported9.6%
  3. Japan9.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Allyl iodide, based on the data on this page

What is Allyl iodide?

Allyl iodide appears as a yellow liquid with a pungent odor. Denser than water and insoluble in water. Hence sinks in water. Vapors are heavier than air. Very irritating to skin, eyes and mucous membranes. Poisonous by ingestion and inhalation. Used to make other chemicals.

What is the CAS number of Allyl iodide?

The CAS registry number of Allyl iodide is 556-56-9.

What is the molecular formula and weight of Allyl iodide?

The molecular formula of Allyl iodide is C3H5I and its molar mass is 167.98 g/mol.

Is Allyl iodide hazardous?

Allyl iodide carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Allyl iodide?

Allyl iodide is usually classified under HS code 290369 (Brominated or iodinated derivatives of acyclic hydrocarbons, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Allyl iodide?

CompoundList lists 9 suppliers of Allyl iodide in China, India, United Arab Emirates, Canada and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Allyl iodide in India?

2 suppliers in India list Allyl iodide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Allyl iodide?

Suppliers quote Allyl iodide 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 Allyl iodide

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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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