3-(Methylthio)propionaldehyde
[CAS# 3268-49-3]

Identification

• Classification: Flavors and spices >> Synthetic spice >> Thioether perfume
• Name: 3-(Methylthio)propionaldehyde
• Synonyms: Methional; 3-Methylthiopropoanaldehyde; Methylmercaptopropionaldehyde
• Molecular Formula: C₄H₈OS
• Molecular Weight: 104.17
• CAS Registry Number: 3268-49-3
• EC Number: 221-882-5
• FEMA: 2747

Properties

• Density: 1.05
• Boiling point: 165-166 °C (11 torr)
• Refractive index: 1.484-1.493
• Flash point: 61 °C

Safety Data

• Hazard Symbols: Xn
• Risk Statements: R20;R36/37/38
• Safety Statements: S26;S37/39

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	4	H302
Skin irritation	Skin Irrit.	2	H315
Acute toxicity	Acute Tox.	3	H311
Serious eye damage	Eye Dam.	1	H318
Skin sensitization	Skin Sens.	1	H317
Acute toxicity	Acute Tox.	4	H332
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Flammable liquids	Flam. Liq.	3	H226
Specific target organ toxicity - single exposure	STOT SE	3	H335
Acute toxicity	Acute Tox.	3	H331
Skin corrosion	Skin Corr.	1B	H314
Eye irritation	Eye Irrit.	2	H319
Specific target organ toxicity - single exposure	STOT SE	1	H370
Acute toxicity	Acute Tox.	4	H312
Specific target organ toxicity - repeated exposure	STOT RE	2	H373
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400

• Transport Information: UN 2785