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Abstract | Cited by

New synthetic approaches to the angular and propellane sesquiterpene triquinanes (±)-pentalenene 2 and (±)-modhephene 3, respectively, are described. The syntheses are based on tandem cyclisations involving α-ketene alkyl radical intermediates produced from α,β-unsaturated acyl radical species, as highlighted in Schemes 2 and 4.

Graphical abstract: Tandem cyclisations involving α-ketenyl alkyl radicals. New syntheses of the natural triquinanes pentalenene and modhephene

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