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The isomerization reactions of styrene oxide (1) and other reactions of (1) with acetone catalyzed by mineral acids (HNO3, H2SO4, H3PO4, HCl) -treated activated carbon were investigated. The following results were obtained : Phenylacetaldehyde was quantitatively obtained (yield 94%) by the isomerization of (1) catalyzed by 2 N HNO3-treated activated carbon in ethyl acetate at 75°C. 2, 2-Dimethyl-4-phenyl-1, 3-dioxolane was synthesize in high yield (81%) by a simple reaction (1) with acetone catalyzed by 2 N H2SO4-treated activated carbon at 55°C.

Preparation of Phenylacetaldehyde and 1, 3-Dioxolanes from Styrene Oxide with Mineral Acid-Treated Activated Carbon Catalyst