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The regioselectivity of the palladium‐catalyzed cyclization of propargylic carbonates with sulfonamide nucleophiles is critically dependent on the bite angle of the bidentate phosphine ligand. Ligands with small bite angles favor attack on the central carbon atom of an allenylpalladium intermediate to afford cyclic dienamide products, whereas the use of those with large bite angles leads to alkynyl...
Oxyacetylen: Zwei beispiellose Palladium‐katalysierte Cyclisierungen von cyclischen und acyclischen Carbonaten führen zum Aufbau von 2‐Alkinyltetrahydrofuranen und ‐tetrahydropyranen. Die Reaktionen verlaufen mit exzellenter Stereoselektivität für sowohl syn‐ als auch anti‐disubstituierte Tetrahydrofurane und Tetrahydropyrane und mit ausgezeichneter Regioselektivität. Zusätzlich wird über eine zweifache...
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