2-Cyclopenteneacetic acid

A recently developed industrially feasible process for the synthesis of a mixture with high (+)-(17 )-cix-isomer content comprises the catalytical hydrogenation of the corresponding cyclopenteneacetic acid in the presence of a ruthenium(II) complex with chiral ligands and subsequent esterification [138]. 

Cyclododecyl acetate Cyclododecyl formate 5-Cyclohexadecen-1 -one Cyclohexanecarboxylic acid Cyclohexanone diethyl acetal Cyclohexanone, 4- [(3,3-dimethylbicyclo [2.2.1] hept-2-yl) methyl]-2-methyl- 2-Cyclohexenyl cyclohexanone Cyclohexyl acetate Cyclohexyl butyrate Cyclohexyl crotonate Cyclohexylcyclohexanone Cyclohexyl cyclopenteneacetate... 

An interesting case in which sol-gel-entrapped and non-entrapped fert-butyldi-methylsilyltriflic acid catalyze different transformations of methyl 1-cyclopenteneacetate in -xylene. While the ceramic catalyst gives 3-methylbenzaldehyde (as the result of a transfer hydrogenation process coupled with intramolecular alkylation, the soluble acid forms only 2- and 3-substituted methyl cyclopenetaneacetates (Parvulescu, 2001). 

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