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Online Edition: "Specifications for Flavourings"

Flavouring (E)-2-Butenoic acid
Synonym(s) (E)-Crotonic acid
Latest JECFA evaluation 2004 (Session 63)
Status of specification Full
Chemical name But-2-enoic acid
JECFA number 1371
CAS number 107-93-7
FEMA number 3908
COE number
FLAVIS number 08.072
Molecular weight 86.09
Chemical formula C4H6O2
Physical form/odour Off-white powder; Harsh, pungent, acrylic odour
Solubility Slightly soluble in water
Solubility in ethanol Soluble
Boiling point (°C)
Assay min % 98%
Acid value max
Refractive index
Specific gravity
Other requirements mp: 71-73°