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674-82-8

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Identification

Name
Acetyl ketene
CAS
674-82-8
Synonyms
4-METHYLENE-2-OXETANONE
Acety ketene
ACETYLKETENE
But-3-en-3-olide
DIKETENE
KETENE DIMER
3-buteno-beta-lactone
3-Butenoic acid, 3-hydroxy-, beta-lactone
3-hydroxy-3-butenoicacibeta-lactone
4-methylene-2-oxetanon
Diketen
diketene,inhibited
Ethenone, dimer
ethenone,dimer
Vinylaceto-beta-lactone
Vinylaceto-lactone
Ketenedimer,99%
Dikitene
Diketene(DK)
4-Methyleneoxetan-2-one
EINECS(EC#)
211-617-1
Molecular Formula
C4H4O2
MDL Number
MFCD00005173
Molecular Weight
84.07
MOL File
674-82-8.mol

Chemical Properties

mp 
-7.5°C
bp 
69-70 °C100 mm Hg(lit.)

density 
1.09 g/mL at 25 °C(lit.)

vapor density 
2.9 (vs air)

vapor pressure 
7.9 mm Hg ( 20 °C)

refractive index 
n20/D 1.439(lit.)

Fp 
95 °F

storage temp. 
2-8°C

CAS DataBase Reference
674-82-8(CAS DataBase Reference)
NIST Chemistry Reference
2-Oxetanone, 4-methylene-(674-82-8)
EPA Substance Registry System
674-82-8(EPA Substance)

Safety Data

Hazard Codes 
Xn
Risk Statements 
R10:Flammable.
R20:Harmful by inhalation.
R40:Limited evidence of a carcinogenic effect.
Safety Statements 
S3:Keep in a cool place .
S36/37:Wear suitable protective clothing and gloves .
S33:Take precautionary measures against static discharges .
S24/25:Avoid contact with skin and eyes .
S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) .
S16:Keep away from sources of ignition-No smoking .
RIDADR 
UN 2929 6.1/PG 2

WGK Germany 
2

RTECS 
RQ8225000

F 
19-21-27
HazardClass 
6.1(a)
PackingGroup 
I
Hazardous Substances Data
674-82-8(Hazardous Substances Data)

Raw materials And Preparation Products

Raw materials
Acetic acid glacial-->Acetone-->Poly(ethylene)-->Butyl acetate-->ketene -->Triethyl phosphate-->Polymerization inhibitor
Preparation Products
Acetic anhydride-->Ethyl acetoacetate-->Chloroacetyl chloride-->5-Methyl-2-phenyl-1,2-dihydropyrazol-3-one-->Methyl acetoacetate-->Acetoacetanilide-->Sorbic acid-->Pigment Red 122-->Quizalofop-p-ethyl-->Dehydroacetic acid-->Butyric anhydride-->2-Acetylbutyrolactone-->Acesulfame-->Imazethapyr-->Ethyl 4-chloroacetoacetate-->6-Methyl-1,2,3-oxathiazin-4(3H)-one 2,2-dioxide potassium salt-->o-Acetoacetaniside-->Olaquindox-->tert-Butyl acetoacetate-->N,N-Diethylacetoacetamide-->Manidipine-->Amitriptyline hydrochloride -->Seedavay(Uniroyal)-->N-Methylacetoacetamide-->Isobutyl acetoacetate-->2'-Chloroacetoacetanilide-->PHOSPHAMIDON-->Acetoacetamide-->2'-Methylacetoacetanilide-->ACETOACETIC ACID N-BUTYL ESTER-->(2R,3S,22S,24S)-2,3,22,23-TETRAHYDROXY-24-ETHYL-BETA-HOMO-7-OXA-5A-CHOLESTAN-6-ONE-->2,6-HEPTANEDIONE-->5-CHLORO-6 B,19-EPOXY-5A-ANDROTANE-3,17-DIONE-->N-Acetyl-N-(4-chloro-2-nitrophenyl)acetamide-->Dichlorosulfophenyl-3-methylpyrazolone-->FEMA 2510-->N,N'-(3,3'-Dimethyl-4,4'-biphenyldiyl)bis(3-oxobutanamide)-->4'-Methoxyacetoacetanilide

Hazard Information

General Description
A colorless liquid with a disagreeable odor. Slightly less dense than water. Flash point 90°F. Irritates skin and eyes. Used to make paints and pharmaceuticals.
Reactivity Profile
DIKETENE is a very reactive dimer, DIKETENE, INHIBITED(674-82-8) may undergo a spontaneous decomposition followed by explosion or ignition [Vervalin, 1973, p.86]. In the presence of bases, amines, mineral acids or Lewis acids a violent polymerization will occur, accompanied by gas evolution [Zdenek, F. et al., Czech Pat. 156 584, 1975].
Air & Water Reactions
Highly flammable. Slightly soluble in water.
Health Hazard
TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.
Fire Hazard
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion and poison hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Material Safety Data Sheet(MSDS)

msds information
Diketene(674-82-8).msds

Spectrum Detail

Spectrum Detail
Acetyl ketene(674-82-8) IR1
Acetyl ketene(674-82-8) 13C NMR
Acetyl ketene(674-82-8) 1H NMR

Well-known Reagent Company Product Information

Sigma Aldrich
674-82-8(sigmaaldrich)
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