Esterification of 4,4-bis(4-hydroxyphenyl)pentanoic acid (I) was performed in a refluxing methanolic solution, using sulfuric acid as the catalyst. The resulting methyl ester (II) was alkylated on both phenolic groups with 2-(chloromethyl)quinoline hydrochloride (III) in the presence of potassium carbonate to afford IV. Hydrolysis of this ester (IV) with NaOH in a refluxing mixture of dioxane-methanol yielded acid (V), which was then converted into the sodium salt on treatment with one equivalent of NaOH in dioxane-methanol.

The reaction of phenol (I) with 4-oxopentanoic acid (II) by means of H2SO4 gives 4,4-bis(4-hydroxyphenyl)pentanoic acid (III), which is esterified with MeOH and H2SO4 to yield the methyl pentanoate (IV). The condensation of (IV) with 2-(chloromethyl)quinoline (V) by means of K2CO3 in DMF affords the adduct (VI), which is finally hydrolyzed with NaOH in methanol/dioxane to provide the target sodium salt. Alternatively, the intermediate methyl pentanoate (IV) can also be obtained by direct condensation of phenol (I) with methyl 4-oxopentanoate (VII) by means of H2SO4 as before.