Radical cyclisation reactions of ketones with alkenes initiated by silver(II) and lead(IV) oxides

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Abstract
Acetone and 2,4-pentanedione react with α-methylstyrene in the presence of the title oxides to form 2,5-dimethyl-5-phenyl-4,5-dihydrofuran and its 3-acetyl derivative, respectively, in about 70% yields. The reaction of these ketones with styrene, which is more prone to telomerisation and polymerisation reactions, gives the corresponding 5-phenylsubstituted 4,5-dihydrofuran derivatives in lower yields (30-40%). Cyclization reaction of acetophenone with 1-octene induced by silver(II) oxide produces 4-n-hexyl-α-tetralone and decanophenone in a 70 : 30 ratio.

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