C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 59/56 (2006.01) C07C 51/08 (2006.01) C07C 51/43 (2006.01) C07C 59/48 (2006.01) C07C 59/64 (2006.01) C07C 201/16 (2006.01) C07C 205/56 (2006.01) C07C 227/42 (2006.01) C07C 229/42 (2006.01) C07C 319/28 (2006.01) C07C 323/62 (2006.01)
Patent
CA 2344004
Process for the preparation of optically highly pure (R)- and (S)-.alpha.-hydroxycarboxylic acids, in which either isolated, impure (R)- and (S)-.alpha.- hydroxycarboxylic acids prepared by acidic hydrolysis of the (R)- and (S)-cyanohydrins obtained by enzyme- catalyzed addition of a cyanide group donor to the corresponding aldehydes or ketones are recrystallized in an aromatic hydrocarbon, optionally in the presence of a cosolvent, and optically highly pure (R)- and (S)- .alpha.-hydroxycarboxylic acids having an optical purity of over 98%ee are obtained or the hydrolysis solution obtained by acidic hydrolysis of the (R)- and (S)- cyanohydrins is treated directly with an aromatic hydrocarbon, optionally in combination with a cosolvent, and is then extracted at hydrolysis temperature, whereupon after cooling of the organic phase the corresponding chemically and optically highly pure (R)- and (S)-.alpha.-hydroxycarboxylic acids having an optical purity of over 98%ee crystallize out.
Mayrhofer Herbert
Pochlauer Peter
Dsm Fine Chemicals Austria Nfg Gmbh & Co Kg
Riches Mckenzie & Herbert Llp
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