Esterification of probucol (I) with succinic anhydride (II) in the presence of NaH afforded the title monosuccinate ester, which was separated from the unreacted probucol (I) and the corresponding disuccinate ester by column chromatography. Esterification of (I) was also reported in the presence of other bases, such as potassium tert-butoxide, KOH, DMAP and DABCO.