TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): (I) is prepared by:(A) adding 4,7-diazosulfide and R1 and R2 substituted tributyltin of oligomerization thiofuran having a mole ratio of 1-1.5:1 into a reaction container;(B) taking tetrahydrofuran as a solvent;(C) introducing an inert gas to discharging air in the container;(D) adding a catalytic amount of dichlorosilane (triphenyl phosphine) palladium catalyst;(E) performing refluxing reaction at 60-80 degrees C;(F) extracting organic phase;(G) drying the extracted organic phase;(H) performing chromatography purification on the organic phase by passing through a silica gel column to obtain bromide connected by R1 and R2 oligomerization thiofuran and diazosulfide;(I) dripping n-butyllithium into the anhydrous tetrahydrofuran solution of tri(4-bromobenzene) at - 78 degrees C (the mol ratio of n-butyllithium to tri(4-bromobenzene)amine is 3-4:1);(J) stirring and reacting at 78 degrees C;(K) adding tributyl tin at a mol ratio of the tributyl tin to the n-butyllithium of 1:1;(L) reacting;(M) extracting and drying the organic phase;(N) removing the solvent to obtain triphenylamine tin compound;(O) adding bromide connected by the R1 and R2 oligomerization thiofuran and diazosulfide and the triphenylamine tin compound into the reaction container at a mol ratio of 10:1-3;(P) taking toluene as solvent;(Q) introducing inert gas to discharge the air in the reaction container;(R) adding tetra(triphenyl phosphine) palladium catalyst;(S) performing refluxing reaction at 100-120 degrees C;(T) adding potassium fluoride aqueous solution that is excess relative to mol amount of the bromide connected by R1 and R2 oligomerization thiofuran and diazosulfide;(U) stirring and extracting the organic phase;(V) drying the extracted organic phase; and(W) performing chromatography purification by passing through the silica gel column.Preferred Method: The first step is conducted at 60-80 degrees C for 12-48 hours. The second step is conducted at 78 degrees C under stirring for 1-2 hours. The room temperature reaction time is 1-24 hours. The third step is conducted for 12-48 hours at 100-120 degrees C. The volume of the dichlorosilane (triphenyl phosphine) palladium catalyst that is capable of dehydrogenizing the 4,7-diazosulfide is 1:20-50. The mole ratio of tetra (triphenyl phosphine) palladium catalyst to three aniline tin compound is 1:10:50. The extracting agent in the first and second steps is methylene dichloride. The extracting agent in the third step is methyl chloride. Preferred Definitions:    R1=H, hexyl, octyl, decyl, or positive n-dodecyl;    R2=H, hexyl, octyl, decyl, n-dodecyl, or substituent triphenylamine;    m=0-6; and    R3=H, Me, butyl, hexyl, methoxy, butoxy, or hexyloxy.