<![CDATA[The utilization of castor oil as a lubricant is very limited, because it was only used on the machine hydraulic. This is because their highly viscosity. In addition, the double bond in ricinoleic acid (cys-12-hydroxy-9-oktadecenoic acid) as the main constituent of castor oil is easily oxidized. The conversion of double bonds in the castor oil into another group will increase its resistance to oxidation. This research aims to synthesize the compounds of the hydroxyl ester derivatives of castor oil by converting the double bond in the fatty acid into hydroxyl and ester groups. This study consists of two main steps: 1) epoxidation of castor oil with performic acids, 2) opening of the epoxide ring with formic acid to form hydroxyl ester compound. Analysis and identification of the compounds is done by thin layer chromategraphy and infrared spectrometry. Characterization of compounds synthesized using the refractive index and viscosity. The results showed that the hydroxyl ester compounds can be synthesized from castor oil by epoxide double bonds and followed by ring opening of epoxides with carboxylic acids. Based on the character of the refractive index and viscosity is known that hydroxyl ester derivatives of castor oil could potentially be used as a]]>
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