1-(2-Bromophenyl)ethyl behenate → 1-(2-Bromophenyl)ethan-1-ol

Interesterification was carried out by using 3 g of Lipase QL, 50 g of (R,S)-1-(2-bromophenyl)ethanol, and 150 g of tribehen under the same conditions as in Example 3 at 105° C. for a period of 20 hours. The water content of the reaction system was 0.01% by weight, and 90% of the lipase particles had a particle size of 30 to 50 μm. Gas chromatography of the reaction mixture revealed that 45 mol % of (R,S)-1-(2-bromophenyl)ethanol had been converted to 1-(2-bromophenyl)ethyl behenate. The reaction mixture was treated in the same manner as in Example 3 and subjected to simple distillation at 110° C. and 5 mmHg to give (S)-(-)-1-(2-bromophenyl)ethanol (yield: 82%; chemical purity: 99.9%; optical purity: 81.5% ee). On the other hand, the residue, i.e., (R)-(+)-1-(2-bromophenyl)ethanol behenic acid ester was acid-hydrolyzed in the same manner as in Example 2 to obtain (R)-(+)-1-(2-bromophenyl)ethanol (yield: 75.6%; chemical purity: 99.8%; optical purity: 99.0% ee).

1. customat 105° C.
2. customof 20 hours
3. additionThe reaction mixture was treated in the same manner as in Example 3
4. distillationsubjected to simple distillation at 110° C.

ORD-Eintrag

ord-d83220a8800c4bd5be0977fd7ef8c75d

Quelldatensatz

uspto-grants-1997_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05696299