5204. 4-(5-Isopropenyl-2-methyl-1-cyclopenten-1-yl)-2-butanone

Nomenclature

CAS number: 87-45-6
4-[2-Methyl-5-(1-methylethenyl)-1-cyclopenten-1-yl]-2-butanone; 4-(2-methyl-5-isopropenyl-1-cyclopenten-1-yl)-2-butanone; Pentione.
C13H20O; mol wt 192.30.
C 81.20%, H 10.48%, O 8.32%.

Description and references

Prepn: Kimel, Sax, US 2799706 (1957 to Hoffmann-La Roche).

Chemical structure

Properties

Pale yellow liquid. Citrus-like odor with woody background. d2525 0.9218. bp0.5 72-75°. nD25 1.4800. Freely sol in diethyl phthalate. At least 10% soly in 70% ethanol, in mineral oil and in corn oil.

Use

In perfumery, i.e., in milled soaps, in modified eau de Cologne, in neroli and orange-blossom compositions. Blends well with ionones.