反应详情

The cyclopentene acid, V, (9.5 g.) is dissolved in 180 ml. of benzene and the solution is hydrogenated at room temperature and atmospheric pressure in the presence of 0.5 g. of palladiated barium sulfate. When the theoretical amount of hydrogen is absorbed, catalyst is filtered off and the solution is evaporated to dryness under vacuum, yielding 9 g. (95%) of the methy ester of 2-carbomethoxy-3-oxo-5-acetoxycyclopentaneacetic acid with the required stereochemical configuration. The compound is a rather unstable solid, melting at 54° C; [α]d25 :- 17.8 (C=1.017% in CHCl3).

1. customis hydrogenated at room temperature
2. customWhen the theoretical amount of hydrogen is absorbed
3. filtrationcatalyst is filtered off
4. customthe solution is evaporated to dryness under vacuum
5. customyielding 9 g