Production process of p-fluoro-m-phenoxy benzaldehyde

The invention discloses a production process of p-fluoro-m-phenoxy benzaldehyde, which comprises the following steps: by taking p-fluoro-m-phenoxy toluene as a raw material, converting the p-fluoro-m-phenoxy toluene into p-fluoro-m-phenoxy benzylidene dichloride with high selectivity under the action of a catalyst, hydrolyzing the p-fluoro-m-phenoxy benzylidene dichloride under an alkaline condition to generate the p-fluoro-m-phenoxy benzaldehyde, the obtained crude fluoroether aldehyde is rectified to obtain refined fluoroether aldehyde, and the total reaction yield is greater than 89%. By selecting the efficient catalyst, the high selectivity and conversion rate of dichlorination are improved, the conditions of single chlorination and excessive chlorination are avoided, the dichlorination product does not need to be purified and is directly subjected to hydrolysis reaction under the alkaline condition to generate crude fluoroether aldehyde, and the crude fluoroether aldehyde is rectified to obtain refined f