4-Methoxybenzyl bromide (I) is condensed with triphenylphosphine in refluxing toluene to produce the phosphonium salt (II). Subsequent Wittig condensation of (II) with 3,5-dimethoxybenzaldehyde (III) gives rise to a mixture of the title Z-stilbene and its E-isomer (IV), which can be separated by means of flash chromatography.