The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) ##STR1## wherein R.sup.2 is 3,4-dimethoxyphenyl or 2-chlorophenyl. According to the present invention, (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid useful as a starting material of a pharmaceutical agent can be efficiently produced with a high optical purity and a relatively high total yield.

La actual invención se relaciona con un método de producción de (el ácido de R)-3-hydroxy-3-(2-phenylethyl)hexanoic que abarca la resolución óptica del ácido racémico 3-hydroxy-3-(2-phenylethyl)hexanoic con una amina ópticamente activa del ## del ## STR1 del fórmula (viii) en donde R.sup.2 es 3,4-dimethoxyphenyl o 2-chlorophenyl. Según la actual invención, (útil ácido de R)-3-hydroxy-3-(2-phenylethyl)hexanoic como un material que comienza de un agente farmacéutico se puede producir eficientemente con una alta pureza óptica y una producción total relativamente alta.

 
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