CAS 121-33-5: Vanillin (C8H8O3)

Identity

CAS Number	121-33-5
Molecular Formula	C8H8O3
IUPAC Name	4-hydroxy-3-methoxybenzaldehyde
Molecular Weight	152.15 g/mol
SMILES	`O=Cc1cc(OC)c(O)c1`
Synonyms	4-hydroxy-3-methoxybenzaldehyde, vanillic aldehyde, methyl vanillin

2D Structure

Physical Properties

Density	1.056 g/mL at 25°C
Boiling Point	285.0°C
Melting Point	81.0°C
Flash Point	147.0°C
Vapor Pressure	2e-05 kPa at 20°C
Refractive Index	nD = 1.558
Dielectric Constant	ε = 10.0

Safety & GHS Classification

Irritant

H302: Harmful if swallowed
H319: Causes serious eye irritation

Storage: Store in cool, dry place in tightly sealed containers. Light-sensitive — store in amber glass. Characteristic vanilla odor. Low toxicity.