Method for preparing compound and method for preparing polymer employing the same

A method for preparing a polymer, comprising:

• reacting a compound having a structure represented by Formula (I) with a compound having a structure represented by Formula (III) in the presence of a compound having a structure represented by Formula (II), obtaining a compound having a structure represented by Formula (IV);
• reacting the compound having the structure represented by Formula (IV) with a compound (A), obtaining a compound having the structure represented by Formula (V), wherein the compound (A) is nitric acid, sulfuric acid, acetic acid, hydrogen peroxide, or a combination thereof;
• and
• reacting the compound having the structure represented by Formula (V) with a compound having a structure represented by Formula (VI), obtaining a polymer having a repeat unit represented by Formula (VII)
• wherein Ar1 is substituted or unsubstituted aryl group;
• X is —O—, —S—, or —NH—;
• R1 is independently hydrogen or C1-6 alkyl group;
• R2 is hydroxyl group, C1-6 alkyl group, phenyl group, or tolyl group;
• R3 is independently C1-6 alkyl group, C5-8 cycloalkyl group, or C2-6 alkoxyalkyl group;
• R5 is hydroxyl group, C1-6 alkyl group, phenyl group, or tolyl group;
• and Ar2 is substituted or unsubstituted aryl diradical.