2,4-Dinitroanisole was synthesized with TEBA as phase transfer catalyst(PTC).The effects of the weight ratio of catalyst to 2,4-dinitrochlorobenzene,reaction temperature and the rate of adding sodium hydroxide were studied.The catalyticr of TEBA was verified comparing with the result in the absence of the catalyst.After adding TEBA the reaction rate was increased significantly.The suitable synthesis conditions were as follows: reaction temperature of 56 ℃,the weight ratio of catalyst to 2,4-dinitrochloroben...