Product

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

CAS No.：1128-08-1

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

Product Name:	2-Pentyl-3-methyl-2-cyclopenten-1-one
Synonyms:	3-METHYL-2-PENTYL-2-CYCLOPENTEN-1-ONE;3-METHYL-2-PENTYL-2-CYCLOPENTENONE;DihydrojasMone (mixture of isomers);3-Methyl-2-(n-pentanyl)-2-cyclopenten-1-one;3-methyl-2-pentyl-2-cyclopenten-1-on;3-methyl-2-pentylcyclopent;Jasmone, dihydro-;Tetrahy-dropyrethrone
CAS:	1128-08-1
MF:	C11H18O
MW:	166.26
EINECS:	214-434-5
Product Categories:
Mol File:	1128-08-1.mol

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.)
refractive index	n20/D 1.479(lit.)
FEMA	3763 \| 3-METHYL-2-(N-PENTANYL)-2-CYCLOPENTEN-1-ONE
Fp	230 °F
form	clear liquid
color	A colourless, slightly oily liquid with a floral-like odour
Specific Gravity	0.914～0.916 (20/4℃)
JECFA Number	1406
BRN	1906471
CAS DataBase Reference	1128-08-1(CAS DataBase Reference)
NIST Chemistry Reference	Dihydrojasmone(1128-08-1)
EPA Substance Registry System	2-Cyclopenten-1-one, 3-methyl-2-pentyl- (1128-08-1)

Safety Information

WGK Germany	2
RTECS	GY7302000
TSCA	Yes
HS Code	29142990
toxicity	The 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 Information

Provider	Language
2-Pentyl-3-methyl-2-cyclopenten-1-one	English
SigmaAldrich	English
ALFA	English

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

Chemical Properties	2-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 Properties	3-Methyl-2-(n-pentanyl)-2-cyclopenten-1-one has a fresh, fruity, jasmine odor with woody and herbal nuances.
Occurrence	Has apparently not been reported to occur in nature.
Preparation	Hexyl bromide plus levulinic ester yields a lactone, which is reacted with polyphosphoric acid or phosphorus pentoxide to produce hydrojasmone.
Taste threshold values	Taste characteristics at 10 ppm: sweet, floral, green, herbal with a citrus nuance.
Synthesis Reference(s)	Canadian Journal of Chemistry, 56, p. 2301, 1978 DOI: 10.1139/v78-379Journal of the American Chemical Society, 92, p. 7428, 1970 DOI: 10.1021/ja00728a029

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

Raw materials

6-Benzylaminopurine-->Jasmone-->n-Hendecane

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