Patent ID: 8217136

Claim:
Method for preparing thieno[3,4-b]pyrazine copolymers by reacting 5,7-disubstituted thieno[3,4-b]pyrazine of the formula I with substituted aromatics of the formula II and/or of the formula III in the presence of solvents, suited bases and polymerization catalysts, wherein represent R 1 /R 2 =Phenyl; pyridine-2yl; pyridine-4-yl; thiophene-2-yl; thiophene-3-yl; 2,2-bipyridine-3,3-diyl; biphenyl-2,2-diyl; —O-alkyl; -phenylene-O-alkyl; or —H X=-halogen; —Ar—CHO; or —Ar-halogen Ar=thieno[3,4-b]pyrazine-5,7-diyl; benzothiadiazol-4,7-diyl; 1,4-phenylene; 1,3-phenylene; 9,10-anthrylene; 2,6-anthrylene; or 2,7-fluorenylene R 3 /R 4 =linearly or branched -alkyl; —O-alkyl; -phenylene-O-alkyl; -styryl; or —H Y=—C≡CH; CR 5 ═CHR 6 ; —B(OH) 2 ; —B(Oalkyl) 2 ; or —CH 2 Z with R 6 =—H; or —Ar-halogen with R 5 =—H; —CN; or —Ar with Z=—P(O)(OAlkyl) 2 ; —P(phenylene) 3 halogen; —P(alkyl) 3 halogen; or —CN Ar=Thieno[3,4-b]pyrazine-5,7-diyl; benzothiadiazol-4,7-diyl; 1,4-phenylene; 1,3-phenylene; 9,10-anthrylene; 2,6-anthrylene; or 2,7-fluorenylene R 3 /R 4 =linearly or branched: -alkyl; —O-alkyl; -phenylene-O-alkyl; -styryl; or —H Y 1 =—C≡CH; —CR 5 ═CHR 6 ; or —CH 2 Z with R 6 =—H; or —Ar-halogen with R 5 =—H; —CN; or —Ar with Z=—P(O)(Oalkyl) 2 ; —P(phenylene) 3 halogen; —P(alkyl) 3 halogen; or —CN; Ar=Thieno[3,4-b]pyrazine-5,7-diyl; benzothiadiazol-4,7-diyl; 1,4-phenylene; 1,3-phenylene; 9,10-anthrylene; 2,6-anthrylene; or 2,7-fluorenylene with disclaiming the reaction of Formula I provided that X=halogen means—with Formula II—when B(OH) 2 or B(Oalkyl) 2 stands for Y and 2,7-fluorenylene stands for Ar—as well as Formula I—when Ar-halogen stands for X—with Formula II—when B(OH) 2 or B(Oalkyl) 2 stands for Y.