Novel Ring Fusion of π-Systems through Pyrazine Ring Formation

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Efficient synthesis of pyrazine-fused dimers was developed through oxidation of amino-substituted porphyrins and anthracenes. In the case of oxidation of aminoanthracene, pyrrole-fused dimers were also obtained under the modified reaction conditions. The structures and properties of fused dimers were elucidated. The optical and electrochemical measurements and theoretical calculations revealed effective extension of π-conjugation in these fused dimers.