METHOD FOR SEPARATING CARBINOLS

摘要

PCT No. PCT/EP96/05596 Sec. 371 Date Aug. 5, 1997 Sec. 102(e) Date Aug. 5, 1997 PCT Filed Dec. 4, 1997 PCT Pub. No. WO97/20817 PCT Pub. Date Jun. 12, 1997A method for predominantly preparing the enantiomer (R)-(+)-5-(phenyl)hydroxymethyl-1-methyl-1H-pyrazole, (R)-(+)-1, by separating the racemate (+)-5-(phenyl)hydroxymethyl-1-methyl-1H-pyrazole of formula (1), comprising the series of steps of using a lipase or material derived therefrom having enzymatic activity in a transesterification reaction, as well as hydrolysing the resulting ester, (S)-(-)-5-(phenyl)alkylcarbonyloxymethyl-1-methyl-1H-pyrazole, of formula (S)-(-)-4, wherein R1 is a methyl or ethyl radical.