Dimethoxybenzaldehyde was prepared from p-cresol by bromination , methoxylation and oxidation. The total yield of product was about 70%.

• 以对甲酚为原料,经过溴化、甲氧基化和氧化3步反应合成3,4-二甲氧基苯甲醛,收率达70%25左右。