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Online Edition: "Specifications for Flavourings"

Flavouring 4-Hydroxy-2-butenoic acid gamma-lactone
Synonym(s) alpha, beta-Crotolactone;2,5-Dihydrofuranone;delta, alpha, beta-Butenolide
Latest JECFA evaluation 2010 (Session 73)
Status of specification Full
Chemical name furan-2(5H)-one
JECFA number 2000
CAS number 497-23-4
FEMA number 4138
COE number
FLAVIS number 10.066
Molecular weight 84.07
Chemical formula C4H4O2
Physical form/odour Colourless to pale brown yellow clear liquid; Rich winey meat-like aroma
Solubility Soluble in water
Solubility in ethanol Soluble
Boiling point (°C) 52-53°
Assay min % 97%
Acid value max
Refractive index 1.466-1.472
Specific gravity 1.183-1.187
Other requirements
ID Test CNMR HNMR MS
Spectrum