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General procedure for the synthesis of β-hydroxynitroalkane compounds. A mixture of aldehydes 1 (2.0 mmol, nitroalkane 2 (5.0 mmol) was stirred in [bmIm]OH (20 mol, at room temperature for 1-8 h. The reactions were monitored by TLC. Upon and on completion, the products were extracted with ethyl acetate, dried with anhydrous Na2SO4, the crude mixture 3 or 4 were subjected to flash column chromatography (ethyl acetate: petroleum ether, 1:5) to give products, bmIm]OH was rinsed with ethyl acetate, dried under a vacuum, and recycled. Compound 6 (Table 2, white solid, mp: 64.0-65.5 °C; IR (KBr, v 3374, 1553, 1424, 1384, 1210, 1073, 1009, 918, 826, 733 cm-1; 1H NMR (400 MHz, CDC13, δ 7.55 (2H, d, J, 8.0 Hz, Ph, 7.30 (2H, d, J, 8.4 Hz, Ph, 5.49 (1H, d, J, 8.8 Hz, CH, 4.49-4.62 (2H, m, CH2, 3.06 (1H, s, br, OH, 13C NMR 100 MH
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5 240.0872, found 240.0879.
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