- Thieno[3,4-b]pyrazines: Synthesis, structure, and reactivity
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A general synthetic route has been developed for the efficient preparation of 2,3-disubstituted thieno[3,4-b]-pyrazines. These methods eliminate problems in the preparation of the precursor 3,4-diaminothiophene and utilize α-diones prepared through the reaction of the appropriate organocuprates with oxalyl chloride. This combination allows the convenient preparation of thieno[3,4-b]pyrazine and its 2,3-disubstituted analogues (where substituent = methyl, hexyl, octyl, decyl, dodecyl, and phenyl) in high yield. Characterization of the structure and reactivity of this class of compounds is also described, including the results of structural, electrochemical, and pKa studies.
- Kenning, Don D.,Mitchell, Kari A.,Calhoun, Tessa R.,Funfar, Melanie R.,Sattler, Daniel J.,Rasmussen, Seth C.
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- Poly(2,3-dihexylthienopyrazine). A New Processable Low Band-gap Polyheterocycle
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A new soluble, low band-gap polymer, poly(2,3-dihexylthienopyrazine) 2b, which is dark blue-black in the neutral state and which becomes transparent light yellow when doped has been prepared; it has a doped film conductivity of 3.6 * 10-2 S cm-1 and a band-gap (film) of ca. 0.95 eV making it one of the lowest band-gap polymers prepared to date.
- Pomerantz, Martin,Chaloner-Gill, Benjamin,Harding, Larry O.,Tseng, John J.,Pomerantz, Wendy J.
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