Ingredient Dictionary

METHYL NONYL KETONE

Undecan-2-one is a dialkyl ketone with methyl and nonyl as the two alkyl groups.

Definition

Undecan-2-one is a dialkyl ketone with methyl and nonyl as the two alkyl groups. It has a role as a rodenticide and a plant metabolite. It is a dialkyl ketone and a methyl ketone.

Source: PubChem

US FDA substance register · UNII YV5DSO8CY9 · registered name 2-UNDECANONE · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

MNK

Cosmetic roles

Gives the product a scentPERFUMING

Safety & regulatory references

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

More data — names, identifiers, properties, test records, literature

Names & identifiers

METHYL NONYL KETONEINCI2-UndecanoneSynonym

CAS No.chemical registry number: 112-12-9
EC No.EU chemical inventory number: 203-937-5
DTXSIDUS EPA chemical ID: DTXSID2021943
DTXCIDUS EPA compound ID: DTXCID301943

IUPAC: Undecan-2-one
Molecular formula: C11H22O
Molecular weight: 170.296 g/mol

Measured properties

Appearance: liquid
Colour: colourless
Melting/freezing point: 15 ℃
Initial boiling point and range: 231~232 ℃
Flash point: 89 ℃((c.c.))
Vapour pressure: (0.6 kJ/mol)
Vapour density: 5.9 ()
Relative density: 0.8250
n-Octanol/water partition coefficient (Kow): 4.09
Molecular weight: 170.30

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: KOSHA safety data sheets (Korea)

What products actually use it for

What the 11 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

Fragrance9
Flavouring and nutrient2

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

2 skin studies and 1 eye studies are on record.

Classed as highly irritating1Classed as low1

The studies disagree (the most common conclusion covers 50%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 3 studies

Severe Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion) according to
Not likely to be sensitizing
skin sensitisation: in vivo (non-LLNA) · Screening · according to OECD Guideline 406 (Skin Sensitisation) adopted17 July 1992
Ambiguous
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) Adopted 24 February 1987 according to EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion) according to