Acetic anhydride is an organic solvent. On dissolution in water it undergoes solvolysis to afford acetic acid. It is widely employed for the acetylation of various alcohols. Wacher process (starting reagent + a ketene) and Knapsack process (starting reagent = acetaldehyde) have been reported for the industrial preparation of acetic anhydride.
Molecular Formula: C4H6O3
Molecular Weight: 102.09
Linear Structural Formula: (CH3CO)2O
MDL Number: MFCD00008705
Purity: >=98.0%
Melting Point: -73 C (lit.)
Density: 1.08 g/mL (lit.)
Refractive Index: n20/D 1.390 (lit.)
Application: Acetic anhydride has been used as one of the reaction components in the preparation of:
•2-acetylamino-5-aminobenzenesulfonic acid
•3,3′-bis(sulfonato)-4,4′-bis(chloroacetamido)azobenzene (BSBCA)
•10-acetoxy-9-nitro-octadecanoic acid, allyl ester
•9-nitro-oleic acidIt may be used for acetylation of anisole over HBEA zeolite in a batch reactor.
RTECS: AK1925000
RIDADR: UN 1715 3(8) / PGII
WGK Germany: 1
Flash Point(F): 120.2 F
Flash Point(C): 49 C
R Codes: 10-20/22-34
S Codes: 26-36/37/39-45
IOD Codes: C
Symbol: GHS02, GHS05, GHS06
Signal Word: Danger
Hazard Statements: H226-H302-H314-H330
Precautionary statements: P210-P260-P280-P304 + P340 + P310-P305 + P351 + P338-P370 + P378