p-Toluenesulfonic acid → 2-Methyl-3H-cyclopenta[a]naphthalene

Participants

Reaction Steps

p-Toluenesulfonic acid (50 mg) was added to the organic layer, and the reaction mixture was heated under reflux with water separation for 1 h. After cooling to room temperature the organic layer was washed with sodium bicarbonate (aqueous 2 wt %, 50 ml), dried over magnesium sulfate, and concentrated under reduced pressure. The yield of 2-methyl-3H-benz[e]indene was 4.1 g or 89%.

Provenance & Evidence