The synthesis of dialkoxyldiphenylmethanes (DAODPMs) from the reactions of alcohols and dichlorodiphenylmethane (DCDPM) were successfully carried out in a liquid-liquid phase transfer catalytic reaction (LL-PTC). The reactions are greatly enhanced by irradiation with ultrasonic waves. Two sequential reactions in the organic-phase solution proceed to produce the desired product. Only the di-chloro-substituted product dialkoxyldiphenylmethanes (DAODPM) is obtained, indicating that the second reaction is faster than the first one in the organic phase. Explanations for the phenomena of the experimental results are provided.