The reaction of 2-hydroxy-3'-methoxybibenzyl (I) with epichlorohydrin (II) by means of NaH in DMF gives 2-(2,3-epoxypropoxy)-3'-methoxybibenzyl (III), which by reaction with dimethylamine in refluxing THF yields 2-[3-(dimethylamino)-2-hydroxypropoxy]-3'-methoxybibenzyl (IV). Finally, this compound is treated with succinic anhydride (V) in refluxing THF and with HCl in acetone.