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General Procedure for the Preparation of Enolates via Manganese Enamides: To a suspension of LiBr (417 mg, 4.8 mmol) in freshly distilled THF (6 mL) in a 3-necked 25-mL round-bottomed flask under argon, MnBr 2 (516 mg, 2.4 mmol) was introduced and the solution was stirred until complete dissolution (transparent pale yellow solution, After addition of n-butylaniline (380 μL, 2.4 mmol) the temperature was cooled to -20°C and methyllithium (3 mL, 4.8 mmol) was introduced dropwise. On keeping the temperature under 0°C, the solution became limpid and red-dark colored after 10 min. The desired ketone (2 mmol) was then slowly added keeping the temperature between -10°C and 10°C. All the Mn enolates were formed in 30 min at this temperature. General Procedure for Michael Addition of Manganese Enolates to Nitroalkenes: The nitroalkenes (1.15 equiv) were added to the enolate solution at the required temperature without previous dissolution. The
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2 = 7.2 Hz, 1 H).
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