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Typical Procedure for the Catalytic Allylation of Aldehydes: A mixture of p-nitrobenzaldehyde (1 mmol), allyltributylstannane (1.2 mmol), benzoic acid (1 mmol), PEG (2 g) and scandium triflate (5 mol%) was placed in a 25 mL round bottomed flask. The mixture was stirred at r.t. for 3 h (monitored by TLC). The reaction mixture was extracted with dry Et2O and the crude product was purified by column chromatography to obtain homoallylic alcohol in excellent yields. The products were characterized by 1H NMR data.
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Typical Procedure for Regioselective Catalytic Allylation of Terminal Aromatic Epoxides: A mixture of styrene epoxide (1 mmol), allytributylstannane (1.2 mmol), and scandium triflate 5 mol%, PEG (2 g) was placed in a 25 mL round bottomed flask. The mixture was stirred at 55-60 °C for 24 h. The reaction mixture was cooled and was extracted by Et2O and the crude product was purified by column chromatography to obtain bishomoallylic alcohol in good yields. The products were characterized by 1H NMR data.
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18 Extraction with dry Et2O is essential for consistency in the activity of the reaction medium in the study of recycling.