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2,6-Dimethyl-5-heptenal Basic information
2,6-Dimethyl-5-heptenal Chemical Properties
Safety Information
  • Hazard Codes Xi
  • Risk Statements 36/37/38
  • Safety Statements 26-36/37/39
  • RIDADR 1987
  • WGK Germany 2
  • RTECS MJ8797000
  • Hazard Note Irritant
  • TSCA Yes
  • HazardClass 3
  • PackingGroup III
  • HS Code 29121900
  • ToxicityBoth the acute oral LD50 value in rats and the acute dermal LD50 value in rabbits exceeded 5 g/kg (Levenstein, 1974).
2,6-Dimethyl-5-heptenal Usage And Synthesis
  • Chemical Properties2,6-Dimethyl-5-hepten-1-al was identified in ginger. It is a yellow liquid with a powerful, green, cucumber-like, and melon odor. It can be prepared by Darzens reaction of 6-methyl-5-hepten-2-one with ethyl chloroacetate. The intermediate glycidate is saponified and decarboxylated to yield the title compound.
    It is used in many fragrance types and is invaluable in the creation ofmelon and cucumber notes.
  • Chemical Properties2,6-Dimethyl-5-heptenal has a characteristic odor of melon and a corresponding taste.
  • OccurrenceReported found in lemon and lime peel oil, sudachi (Citrus sudachi H. ex. Shirai) and ginger.
  • PreparationBy condensation of isobutyric aldehyde with α-methylcrotonaldehyde, followed by par tial hydrogenation; also from methylheptenone through Darzen's reaction.
  • Aroma threshold valuesDetection: 16 ppb
  • Taste threshold valuesTaste characteristics at 50 ppm: green, melon, watermelon-rind, cucumber, with a waxy, chemical and floral nuance.
  • Trade nameMelonal (Givaudan), Melomor (Aromor).
  • Safety Profileskin and eye irritant. When heated to decomposition it emits acrid smoke and irritating fumes.
2,6-Dimethyl-5-heptenal Preparation Products And Raw materials
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