Method of preparing malononitrile oxime ether compound and intermediate compound

A preparation method for a malononitrile oxime ether compound represented by a formula (VI),

• wherein W is selected from aryl groups or heteroaryl groups,
• the preparation method comprises the following steps:
• enabling a first raw material of formula (IV) to be reacted with a second raw material of formula (V) in the presence of a first solvent and a catalyst to obtain an intermediate compound of formula (VI), wherein the intermediate compound of formula (VI) is synthesized by a synthetic route as follows:
• wherein LG represents leaving groups, M is selected from monovalent cations, W is selected from aryl groups or the heteroaryl groups, “” represents a chemical bond, and a configuration of double bonds may be (Z)- or (E)-;
• and performing a dehydration reaction with the intermediate compound represented by the formula (VI) and a dehydrating agent in the presence of a second solvent to obtain the malononitrile oxime ether compound represented by formula (VII), wherein the malononitrile oxime ether compound represented by formula (VII) is synthesized by a synthetic route as follows: