A process is described for preparing a compound of the formula or the S-enantiomer thereof, wherein: R is alkyl, aryl, cycloalkyl, aralkyl, or cycloalkylalkyl, R.sup.1 is halogen; R.sup.2 is halogen, alkyl, cycloalkyl, aryl or ##STR1## wherein the process comprises treating the associated racemic alcohol with an acylating agent ##STR2## (wherein L is a leaving group) and an enzyme or microorganism capable of enantioselective acylation. This process may also be used to isolate the unreacted R- or S-alcohol. The acylated product may be enantioselectively hydrolyzed with a lipase or lipase-supplying microorganism to the S- or R-alcohol. Compounds prepared by this invention are useful antipsychotic agents or useful intermediates therefor.

Um processo é descrito preparando um composto da fórmula ou do S-s-enantiomer disso, wherein: R é alkyl, arilo, cycloalkyl, aralkyl, ou o cycloalkylalkyl, R.sup.1 é halogênio; R.sup.2 é halogênio, alkyl, cycloalkyl, arilo ou ## do ## STR1 wherein o processo compreende o tratamento do álcool racemic associado com um ## acylating do ## STR2 do agente (wherein L é um grupo saindo) e um enzyme ou um microorganism capaz do acylation enantioselective. Este processo pode também ser usado isolar o r ou o S-álcool unreacted. O produto acylated pode enantioselectively hydrolyzed com um lipase ou um microorganism lipase-fornecendo ao s ou ao R-álcool. Os compostos prepararam-se por esta invenção são agentes antipsychotic úteis ou intermediários úteis therefor.

 
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