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35
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33744818309
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note
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+.
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36
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33744813116
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note
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+).
-
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37
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33744798604
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note
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The immobilized Candida antarctica lipase B (CALB) was provided by Novo Nordisk Co., Ltd. as CHIRAZYME L-2 (5 KU/g).
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38
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33744796378
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note
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General procedure: CALB (40 mg) and n-butanol (0.672 mmol) were added to a solution of O-acyl binaphthol (±)-2 or (±)-3 (0.0672 mmol) and acetophenone (2.0 mg, standard substance) in solvent (2 mL) and the resulting mixture was stirred at 30-80 °C. The reaction conversion and enantiomeric excess were determined using HPLC (column, Daicel Chiralcel OG; mobile phase, hexane/2-propanol = 15:1; flow rate, 0.5 mL/min; UV detection at 254 nm). E values were calculated according to literature (see Ref. 31). Absolute configurations of the products were determined using HPLC (OG column) data of commercially available (R) and (S) BINOL.
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40
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33744819294
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-
note
-
20 +32.6 (c 1.0, THF)}.
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-
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41
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33744806206
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note
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Procedure of (R)-4 and (S)-5: CALB (40 mg) and alcohol (0.672 mmol) were added to a solution of (±)-5 (0.0672 mmol) and acetophenone (2.0 mg, standard substance) in toluene (2 mL) and the resulting mixture was stirred at 80 °C. The reaction conversion and enantiomeric excess were determined using HPLC (column, Daicel Chiralcel OD; mobile phase, hexane/2-propanol = 9:1; flow rate, 0.5 mL/min; UV detection at 254 nm). E values were calculated according to literature (see Ref. 31). Absolute configurations of the products were determined using HPLC (OD column) data of (R)-4 which was derived from commercially available (R)-BINOL.
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