Abstract
The reactions of trimethylhydroquinone with isoprenoid allylic alcohols catalyzed by a Pentasil type zeolite in the H-form gave trimethyl-1,4-benzoquinones with the corresponding isoprenoid group, which were subsequently transformed into the target Δ3-chromenes on treatment with pyridine. Partial ozonolysis of chromenes proceeded selectively at the Δ-bond of the side chain, resulting in the corresponding chromenes with an ω-carbonyl group.
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