Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 6, Pages 2067-2075Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201203503
Keywords
CC coupling; donoracceptor systems; dyes; sensitizers; iodine; sulfur heterocycles
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Funding
- JSPS
- MEXT
- Ritsumeikan Global Innovation Research Organization (R-GIRO) project
- Asahi Glass Foundation
- NEDO of Japan
- JSPS for young scientists
- Grants-in-Aid for Scientific Research [24689002, 11J09317, 23790030] Funding Source: KAKEN
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We have successfully established an efficient route to the core structure of donoracceptor head-to-tail (HT)-linked regioregular oligothiophenes, which includes the following key synthetic steps, that is, hypervalent iodine induced direct and regioselective coupling of thiophenes and the use of the obtained bithiophenes as excellent coupling substrates for the Suzuki and Stille couplings. The versatility of this new approach is highlighted in the dramatic improvement of the yield (ca. 59% overall yield) of MK-2, a high-performance organic dye, for photovoltaic applications.
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