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Online Edition: "Specifications for Flavourings"

Flavouring 2-Acetyl-5-methylthiophene
Synonym(s) 2-Methyl-5-acetylthiophene;1-(5-Methyl-thienyl)ethan-1-one
Latest JECFA evaluation 2012 (Session 76)
Status of specification Full
Chemical name 1-(5-Methylthiophen-2-yl)ethanone
JECFA number 2107
CAS number 13679-74-8
FEMA number 4643
COE number
FLAVIS number
Molecular weight 140.2
Chemical formula C7H8OS
Physical form/odour Colourless to pale yellow liqud to crystalline powder at lower temperatures; Roasted aroma with sweet notes
Solubility Very slightly soluble in water
Solubility in ethanol Soluble
Boiling point (°C) 232-234°
Assay min % 95%
Acid value max
Refractive index 1.557-1.567
Specific gravity 1.120-1.130 (20°)
Other requirements m.p. 24-28°
ID Test IR