CARBONIUM CYCLIZATION--STUDIES ON LIGNANS CONTAINING THE DIBENZOCYCLOOCTADIENE SYSTEM.Ⅱ

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Schisandrin(1)under the Ritter reaction conditions(conc.H<sub>2</sub>SO<sub>4</sub>/CH<sub>3</sub>CN)gave trace amounts of the expected acetamidoderivatives(2a,2b).The main product is 5a,from intramolecular car-bonium c
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