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Online Edition: "Specifications for Flavourings"

Flavouring 2-Hexyl-5 or 6-keto-1,4-dioxane
Synonym(s) 5(or 6)-Hexyl-1,4-dioxan-2-one;(1 or 2-Hexyl-2-hydroxyethoxy)acetic acid, d-lactone
Latest JECFA evaluation 2005 (Session 65)
Status of specification Full
Chemical name 2-Hexyl-5 or 6-keto-1,4-dioxane
JECFA number 1486
CAS number 65504-97-4
FEMA number 2574
COE number
FLAVIS number
Molecular weight 186.25
Chemical formula C10H18O3
Physical form/odour Colourless or very pale yellow liquid; Powerful sweet, nut-like aroma
Solubility Slightly soluble in water; Soluble in oil
Solubility in ethanol Soluble
Boiling point (°C) 104° (15 mm Hg)
Assay min % 97%
Acid value max
Refractive index 1.486-1.492
Specific gravity 1.280-1.286
Other requirements [Lactone undergoes ring opening in basic solution]