Synthesis method of 2, 2'-(2, 2'-dipyridyl-4, 4'-dimethyl) di-malononitrile and substitute for 2, 2'-(2, 2'-dipyridyl-4, 4'-dimethyl) di-malononitrile

The invention belongs to the field of organic synthesis technology, and particularly relates to a synthesis method of 2, 2'-(2, 2'-dipyridyl-4, 4'-dimethyl) di-malononitrile and a substitute for 2, 2'-(2, 2'-dipyridyl-4, 4'-dimethyl) di-malononitrile. The synthesis method comprises the following steps: with malononitrile and bipyridyl dialdehyde compound shown by formula (II) as raw materials, stirring for reaction for 1-6h at the temperature of 45-160 DEG C, and after the reaction, carrying out aftertreatment on reaction liquid to obtain the target product shown by formula (I), wherein the molar ratio of bipyridyl dialdehyde compound to malononitrile is 1: 2.5-8. The formula (II) and (I) are shown in the specification, wherein R1 is H, CH3 or C2H5, and R2 is H, CH3 or C2H5. According to the method, the bipyridyl dialdehyde compound and malononitrile are taken as raw materials, and the method is carried out under the condition that solvent and catalyst are not available, so that the operation is simple and convenient, and the product yield is high.