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Typical experimental procedure: Palladium acetate (5.6 mg, 0.025 mmol, DPPE (10 mg, 0.025 mmol, potassium carbonate (83 mg, 0.60 mmol, and TBAB (190 mg, 0.60 mmol) were placed in a 20-mL reaction flask quipped with a Dimroth condenser. The flask was filled with argon by using a standard Schlenk technique. Ketene dithioacet al. monoxide 1 (74 mg, 0.50 mmol) and 4-iodoanisole (140 mg, 0.60 mmol) were dissolved in DMF (2.0 mL, and the solution was transferred to the reaction flask. The resulting mixture was stirred for 24 h at 100 °C. The reaction was quenched with water (20 mL, and the product was extracted with ethyl acetate (10 mL × 3, The combined organic layer was dried over sodium sulfate and concentrated in vacuo. Silica gel column purification of the crude oil by using hexane/ethyl acetate=1:2 yielded 2a (126 mg, 0.50 mmol) in 99% yield. The stereochemistry of 2 was determined according to the literature: T. Wedel, M. Müller, 5. Podlech, H
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2: C. 56.66; H. 5.55%.
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