2-CYCLOPENTEN-1-ONE, 3-METHYL-2-PENTYL

Diketones are readily transformed to cyclic derivatives, such as cyclopentanones and furans. In this manner, the fragrance dihydrojasmone (3-methyl-2-pentyl-2-cyclopenten-l-one) is prepared by the base-catalyzed aldol condensation of 2,5-undecanedione. 2,5-Undecanedione is itself prepared from heptanal and methyl vinyl ketone in the presence of thiazolium salts (329). cis-jasmone can be similarly prepared (330,331). [Pg.499]

Methyl-2-pentyl-2-cyclopenten-l-one 2-Cyclopenten-l-one, 3-methyl-2-pentyl - (8,9) (1128-08-1)... [Pg.164]

METHYL-2-PEtfTYL-2-CYCLOPEKTEN-l -ONE 2-CYCLOPENTEN-l -ONE, 3-METHYL-2-PENTYL- (1128-08-1), 65, 26... [Pg.254]

Many cyclic ketones occur in natural oils. Jasmone [488-10-8] (3-methyl-2-(2-pentyl)-2-cyclopenten- 1-one) (4) is an odoriferous component of the oil obtained from jasmine flowers. /-Menthone [14073-97-3] (5) is the most frequently occurring of four optically active isomers, and is a colorless liquid with a minty odor obtained from Mentha species of plants. Muscone [541 -91-3] (6) and civetone [542 -6-1] (7) are expensive animal products. [Pg.500]

Cyclopentanes, synthesis, 66, 10 CYCLOPEKTANONE SYNTHESIS, 66, 87, 92, 93 Cyclopentanone, 2-carbomethoxy-3-vinyl, 66, 56 Cyclopentanone, 2-ethenyl-2-methyl (88729-76-4), 66, 94 2-CYCLOPENTEN-l-ONE, 3-METHYL-2-PENTYL-, 65, 26 Cyclopropane, l-trimethy1s1lyloxy-1-ethoxy-, 56, 44 Cyclopropanecarboxylic acid chloride, 66, 176... [Pg.121]

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