CompoundList
Sign in
Synthetic aroma chemicals

alpha-Ionone

Also known as (E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one, (E)-alpha-Ionone, trans-alpha-Ionone

CAS 127-41-3Formula C13H20OMolar mass 192.30 g/molEC 204-841-6
GHS signal word: Danger. Pictograms: Serious health hazard 32 suppliers listed
Get quotes Compare 32 suppliers
alpha-Ionone chemical structure, C13H20O, CAS 127-41-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless to slightly yellow liquid
Boiling point
258 °C
Density
0.9319 at 20/4 °C
Flash point
118 °C
Solubility
In water, 106 mg/L at 25 °C
HS code
291423
Category
Synthetic aroma chemicals
Illustrative photo, a 1000 litre IBC tote of clear liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is alpha-Ionone?

Plain description, key identifiers and synonyms

Alpha-ionone is an ionone, an enone and a methyl ketone.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one
CAS number
127-41-3 CAS number cross-checkedOther or deprecated CAS: 14398-36-8, 31798-12-6, 6901-97-9, 8013-90-9
EC numbers
204-841-6, 230-010-2, 232-396-8, 238-362-9, 250-293-6, 250-812-6
Molecular formula
C13H20O
UNII
I9V075M61R
MDL number
MFCD00001565
INCI name
ALPHA-IONONE
InChIKey
UZFLPKAIBPNNCA-BQYQJAHWSA-N
InChI
InChI=1S/C13H20O/c1-10-6-5-9-13(3,4)12(10)8-7-11(2)14/h6-8,12H,5,9H2,1-4H3/b8-7+
Canonical SMILES
CC(=O)C=CC1C(C)=CCCC1(C)C
Isomeric SMILES
CC1=CCCC(C1/C=C/C(=O)C)(C)C

Synonyms

  • (E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one
  • (E)-alpha-Ionone
  • trans-alpha-Ionone
  • alpha-(E)-ionone
  • alpha-Ionon
  • (3E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one
  • alpha-Cyclocitrylideneacetone
  • (E)-(1)-4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-one
  • (E)-4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-one
  • I+--Ionone
  • a-ionone
  • Iraldeine
  • 4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one
  • 3-Buten-2-one, 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-, (3E)-
  • Ionone, alpha-
  • 4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-one
  • a-Ionone (>90%)
  • (5E)-Ionone
  • 3-Buten-2-one, 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-, (E)-
  • alpha-Ionone (natural)
  • alpha-Jonone
  • Cyclocitrylideneacetone, alpha-
  • beta-lonone (natural)
  • (+-)-trans-alpha-Ionone
  • (S-(E))-4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-one
Show all 31 synonyms
  • (E)-alpha-lonone
  • Ionone, alpha
  • (-)-4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-one
  • alpha-Ionone, >=90%
  • alpha-Ionone (>90per cent)
  • alpha-Ionone, natural, >=86%

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 to slightly yellow liquidexp.
Odour
It has a warm, woody, floral odor with balsamic and sweet tones and is strongly reminiscent of violet flowers.exp.
Taste
Woody, floral, berry, fruity with powdery nuancesexp.
Boiling point
258 °Cexp.
Density
0.9319 at 20/4 °Cexp.
Flash point
118 °Cexp.
Solubility
In water, 106 mg/L at 25 °Cexp.
Vapour pressure
0.019 mm Hg at 25 C (extrapolated from higher temperatures)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
192.30 g/molcalc.
Exact mass
192.1514 Dacalc.
LogP (octanol/water)
3.51calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
2calc.
Heavy atoms
14calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.62calc.
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, C1=CCCCC1

C1=CCCCC1

1 ring, 6 atoms, the Cyclohexene ring system.

5,167 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS08: Serious health hazard
Serious health hazard
100NFPA 704 rating

Hazard statements

  • H334May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Precautionary statements (8)
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P271Use only outdoors or in a well-ventilated area.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P342 + P316If experiencing respiratory symptoms: Get emergency medical help immediately.
  • P403Store in a well-ventilated place.
  • 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

alpha-Ionone suppliers

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

All 32 suppliers
30 of 30 offers

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

32 suppliers in 8 countries

Send one request to many suppliers

Choose up to 10 suppliers or let us match your request. Compare quotes side by side, free.

Choose suppliersPost a request

alpha-Ionone 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.

Get latest price

Uses and applications

What the substance is used for, by industry and function

Reported uses (ppm):

Table: Reported uses (ppm): (Flavor and Extract Manufacturers' Association, 1994) [Table#8259].

Fragrance ingredient in perfumery, in cosmetics and personal care products, in household cleaners and detergents. Flavoring agent in beverages, baked goods, and candies.

Used as an ingredient in dog/cat repellent, attracts adult rose chafers (a beetle).

Industrial uses: Fragrance, Other.

Consumer uses: Other, Fragrance.

Cosmetic ingredient, INCI name ALPHA-IONONE(perfuming)

Functional uses

  • Flavouring and nutrient
  • Fragrance

Cosmetic functions

  • Perfuming

How it is made

By condensing citral with acetone to form pseudoionone, which is then cyclized by acid-type reagents.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

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 alpha-Ionone is traded under.

HS 2914.23Indicative HS code

Ionones and methylionones

World exports in 2024
$145M
+11.9% vs 2023, imports $157M
2019 to 2024
Top exporters
  1. China29.6%
  2. Germany24.0%
  3. Switzerland * partner reported23.5%
Top importers
  1. United States16.5%
  2. Netherlands10.2%
  3. Singapore10.2%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about alpha-Ionone, based on the data on this page

What is alpha-Ionone?

Alpha-ionone is an ionone, an enone and a methyl ketone.

What is the CAS number of alpha-Ionone?

The CAS registry number of alpha-Ionone is 127-41-3. Other or deprecated CAS numbers: 14398-36-8, 31798-12-6, 6901-97-9.

What is the molecular formula and weight of alpha-Ionone?

The molecular formula of alpha-Ionone is C13H20O and its molar mass is 192.30 g/mol.

What is alpha-Ionone used for?

Reported uses (ppm): Table: Reported uses (ppm): (Flavor and Extract Manufacturers' Association, 1994) [Table#8259]. Fragrance ingredient in perfumery, in cosmetics and personal care products, in household cleaners and detergents. Flavoring agent in beverages, baked goods, and candies.

Is alpha-Ionone hazardous?

alpha-Ionone carries the GHS signal word "Danger". Main hazards: may cause allergy or asthma symptoms or breathing difficulties if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of alpha-Ionone?

alpha-Ionone is usually classified under HS code 291423 (Ionones and methylionones). This is indicative, confirm it with your customs broker before shipping.

Where can I buy alpha-Ionone?

CompoundList lists 32 suppliers of alpha-Ionone in China, India, United States, Egypt and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy alpha-Ionone in India?

6 suppliers in India list alpha-Ionone on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of alpha-Ionone?

Suppliers quote alpha-Ionone 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 alpha-Ionone

Get quotes for alpha-Ionone

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Post a request Sell alpha-Ionone
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of alpha-Ionone with a 3D view, its CAS number where known and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/alpha-ionone-127-41-3" title="alpha-Ionone structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Synthetic aroma chemicals or HS code 291423

32 suppliers
Free quotes, contact stays private
Get quotes