Ingredient Dictionary

3-ISOPENTENOL

Isopentenyl alcohol is a primary alcohol having the structure of isopentyl alcohol but with a double bond between C-3 and one of the C-4 atoms.

Definition

Isopentenyl alcohol is a primary alcohol having the structure of isopentyl alcohol but with a double bond between C-3 and one of the C-4 atoms. It has a role as a metabolite. It is a homoallylic alcohol and a primary alcohol.

Source: PubChem

US FDA substance register · UNII KJ25C8CPFA · registered name 3-METHYL-3-BUTEN-1-OL · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

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

3-ISOPENTENOLINCI3-Buten-1-ol, 3-methyl-Synonym

CAS No.chemical registry number: 763-32-6
EC No.EU chemical inventory number: 212-110-8
DTXSIDUS EPA chemical ID: DTXSID4052506
DTXCIDUS EPA compound ID: DTXCID8031079

IUPAC: 3-Methylbut-3-en-1-ol
Molecular formula: C5H10O
Molecular weight: 86.134 g/mol

Measured properties

Appearance: Liquid · Colorless liquid, [Acros Organics MSDS]
Boiling point: 130.00 °C. @ 760.00 mm Hg
Solubility: 170 g/L @ 20 °C (exp)
Colour: colourless
Melting/freezing point: 129.9 ℃
Initial boiling point and range: 132 ℃
Flash point: 42 ℃
Upper/lower flammability or explosive limits: 9.3 / 3.0 %
Vapour pressure: 3.55 ㎜Hg
Water solubility: 35100 ㎎/ℓ (25℃)
Relative density: 0.85
n-Octanol/water partition coefficient (Kow): 1.25
Auto-ignition temperature: 345 ℃
Molecular weight: 86.132

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: PubChem · KOSHA safety data sheets (Korea)

What products actually use it for

What the 7 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.

Fragrance4
Flavouring and nutrient3

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

1 skin studies and 2 eye studies are on record.

Classed as low1

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 3 studies

Studies Indicate No Significant Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) equivalent or similar to
Corrosive or Irritation Persists for > 21 days
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) equivalent or similar to
Category 6.4A (Category 2A)
Eye Irritation · Read Across