Food safety and quality: details

Flavouring	4-Hexen-3-one
Synonym(s)	2-Hexen-4-one
Latest JECFA evaluation	2020 (Session 89)
Status of specification	Full
Information required
Chemical name	Hexen-4-en-3-one
JECFA number	1125
CAS number	2497-21-4
FEMA number	3352
COE number	718
FLAVIS number
Molecular weight	98.14
Chemical formula	C6H10O
Physical form/odour	Colourless to yellow liquid; pugent, acrid, metallic odour
Solubility	slightly soluble in water; soluble in oil
Solubility in ethanol	Miscible at room temperature
Boiling point (°C)	93° (150 mm Hg)
Assay min %	95% (sum of isomers)
Acid value max
Refractive index	1.437-1.443
Specific gravity	0.855-0.861
Other requirements	Isomers: 90-95% trans-4-hexen-3-one and 1-5% cis-4-hexene-3-one
ID Test	NMR
Spectrum