Rates and products of the acid-catalyzed and spontaneous reactions of cyclo
penta[cd]pyrene oxide (2) and acenaphthalene oxide (3) in 1:3 dioxane-water
and water, respectively, have been determined. Both 2 and 3 undergo acid-c
atalyzed hydrolyses to yield cis diol as the major product, and undergo spo
ntaneous reactions to yield predominantly ketone products. The mechanisms o
f these reactions are discussed.