2-Pentyl-3-methyl-2-cyclopenten-1-one CAS#: 1128-08-1

2-Pentyl-3-methyl-2-cyclopenten-1-one

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2-Pentyl-3-methyl-2-cyclopenten-1-one Basic information

2-Pentyl-3-methyl-2-cyclopenten-1-one Chemical Properties

Boiling point:120-121 °C12 mm Hg(lit.)
Density 0.916 g/mL at 25 °C(lit.)
FEMA 3763 | 3-METHYL-2-(N-PENTANYL)-2-CYCLOPENTEN-1-ONE
refractive index n20/D 1.479(lit.)
Flash point:230 °F
Specific Gravity0.914～0.916 (20/4℃)
color A colourless, slightly oily liquid with a floral-like odour
JECFA Number1406
BRN 1906471
CAS DataBase Reference1128-08-1(CAS DataBase Reference)
NIST Chemistry ReferenceDihydrojasmone(1128-08-1)
EPA Substance Registry System2-Cyclopenten-1-one, 3-methyl-2-pentyl- (1128-08-1)

Safety Information

WGK Germany 2
RTECS GY7302000
TSCA Yes
HS Code 29142990
ToxicityThe acute oral LD₅₀ in rats was reported as 2.5 g/kg (1.79-3.50 g/kg) (Keating, 1972). The acute dermal LD₅₀ value in rabbits was reported as 5 g/kg (Keating, 1972).

MSDS

2-Pentyl-3-methyl-2-cyclopenten-1-one Usage And Synthesis

Chemical Properties2-Pentyl-3-methyl-2-cyclopenten-1-one is a colorless, slightly viscous liquid with a typical jasmine odor, resembling that of the naturally occurring (Z)-jasmone. Dihydrojasmone is produced by an acid-catalyzed rearrangement of 4-methyl-??-decalactone, which is readily obtained by radical addition of 2-octanol to acrylic acid.
Dihydrojasmone is used in perfumery in jasmine bases and, more generally, in floral and fruity fragrances.
Chemical Properties3-Methyl-2-(n-pentanyl)-2-cyclopenten-1-one has a fresh, fruity, jasmine odor with woody and herbal nuances.
OccurrenceHas apparently not been reported to occur in nature.
PreparationHexyl bromide plus levulinic ester yields a lactone, which is reacted with polyphosphoric acid or phosphorus pentoxide to produce hydrojasmone.
Taste threshold valuesTaste characteristics at 10 ppm: sweet, floral, green, herbal with a citrus nuance.

2-Pentyl-3-methyl-2-cyclopenten-1-one Preparation Products And Raw materials

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