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Online Edition: "Specifications for Flavourings"

Flavouring 3-Mercapto-2-butanone
Latest JECFA evaluation 2000 (Session 55)
Status of specification Full
Chemical name 3-Mercapto-2-butanone
JECFA number 558
CAS number 40789-98-8
FEMA number 3298
COE number 11497
FLAVIS number
Molecular weight 104.17
Chemical formula C4H8OS
Physical form/odour colourless or pale yellow liquid, becomes cloudy after short storage
Solubility slightly soluble in water; soluble in alcohol, ether, pyridine and aqueous alkalis
Solubility in ethanol
Boiling point (°C) 50° (18 mm Hg)
Assay min % 99%
Acid value max
Refractive index 1.469-1.479
Specific gravity 1.016 (20°)
Other requirements
ID Test IR