Online Edition: "Specifications for Flavourings"


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Flavouring 4-Methyl-3-penten-2-one
Synonym(s) Isopropylidene acetone
Mesityl oxide
Methyl isobutenyl ketone
Latest JECFA evaluation 2002 (Session 59)
Status of specification Full
Chemical name 4-Methylpent-3-en-2-one
JECFA number 1131
CAS number 141-79-7  
FEMA number 3368
COE number 11853
FLAVIS number -
Molecular weight 98.14 
Chemical formula C6H10O  
Physical form/odour Colourless oily liquid; unpleasant grassy-green or pungent, acrylic odour 
Solubility slightly soluble inwater; miscible in organic solvents 
Solubility in ethanol Miscible at room temperature 
Boiling point (°C) 128-130
Assay min % 95%
Acid value max -
Refractive index 1.442-1.447
Specific gravity 0.862-0.868
Other requirements -
ID Test NMR
Spectrum http://www.fao.org/ag/agn/jecfa-flav/img/img/1131.gif