Iodine → 2-Cyclopenten-1-one, 2-pentyl-

Participants

Reaction Steps

In a 100 ml four-neck flask fitted with a thermometer, a reflux condenser and a stirrer were placed 2-pentylidenecyclopentanone (30 g) synthesized in Reference Example 4, cyclopentanone (31.6 ml) and iodine (30 mg), followed by 4 hours of the reaction under refluxing. The reaction mixture was washed with water and the layers were separated from each other. The resulting organic layer was washed with saturated brine and separated. The organic layer was evaporated on a rotary evaporator under reduced pressure to recover cyclopentanone, whereby a crude product (30.2 g) was obtained. The product was distilled using a Claisen distillation apparatus to obtain 25.3 g of 2-pentyl-2-cyclopentenone (boiling point: 101° C./900 Pa; GC purity: 97.9%).

Provenance & Evidence