1, 4-Epoxy-1, 4-dihydronaphthalene or its 5, 6, 7, 8-tetrahalogeno (chloro or fluoro) derivatives were readily isomerized to 1-naphthol or 5, 6, 7, 8-tetrahalogeno-1-naphthols when they were treated with activated alumina. Acidic alumina was the most effective for this purpose. For example, 5, 6, 7, 8-tetrafluoro-1-naphthol was obtained quantitatively when a benzene solution of 5, 6, 7, 8-tetrafluoro-1, 4-epoxy-1, 4-dihydronaphthalene was poured into an acid-treated alumina column and then the absorbed products were eluted out with alcohol.
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