Ingredient Dictionary

2-METHYL-3-BUTEN-2-OL

3-hydroxy-3-methylbut-1-ene is a tertiary alcohol that is 3-methylbut-1-ene carrying a hydroxy substituent at position 3.

Definition

3-hydroxy-3-methylbut-1-ene is a tertiary alcohol that is 3-methylbut-1-ene carrying a hydroxy substituent at position 3. It has a role as a pheromone, a fragrance, an animal metabolite and a plant metabolite. It is a tertiary alcohol and an olefinic compound. It derives from a hydride of a 3-methylbut-1-ene.

Source: PubChem

US FDA substance register · UNII SH64HE46L9 · registered name 3-HYDROXY-3-METHYLBUTENE · 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

2-METHYL-3-BUTEN-2-OLINCI3-Buten-2-ol, 2-methyl-Synonym

CAS No.chemical registry number: 115-18-4
EC No.EU chemical inventory number: 204-068-4
DTXSIDUS EPA chemical ID: DTXSID3047471
DTXCIDUS EPA compound ID: DTXCID1027471

IUPAC: 2-Methylbut-3-en-2-ol
Molecular formula: C5H10O
Molecular weight: 86.134 g/mol

Measured properties

Appearance: Methyl butenol is a colorless liquid. (USCG, 1999) · Colorless liquid, [CAMEO] Colorless liquid with an odor like alcohol, [Alfa Aesar MSDS]
Boiling point: 208.4 to 210.2 °F at 760 mmHg (USCG, 1999) · 97.00 to 99.00 °C. @ 760.00 mm Hg
Melting point: -28 °C
Solubility: 1000 mg/mL · Solubility in water, g/100ml at 20 °C: 19 (good)
Density: 0.824 (USCG, 1999) - Less dense than water, will float · 0.8 g/cm³
Colour: colourless
pH: 9-10 ()
Melting/freezing point: -28 ℃
Initial boiling point and range: 97 ℃((1 atm))
Flash point: 10 ℃
Upper/lower flammability or explosive limits: 9.4 / 1.5 %
Vapour pressure: 51 ㎜Hg ((25 ℃))
Vapour density: 3.0 ()
Relative density: 0.824
n-Octanol/water partition coefficient (Kow): 0.66
Auto-ignition temperature: 380 ℃
Molecular weight: 86.13

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 5 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.

Fragrance3
Flavouring and nutrient2

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

2 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 4 studies

Classification not possible
Skin Sensitization · Screening
Not classified
Skin Irritation · Screening
Category 6.4A (Category 2A)
Eye Irritation · Read Across
Not classified
Eye Irritation · Screening