Volume 2013, Issue 14 p. 2788-2791
Short Communication

One-Pot, Regioselective Consecutive Multihalogenation of 2,2′-Bithiophene

Bo Ram Kim

Bo Ram Kim

Department of Chemistry & Research Institute of Natural Sciences Department of Chemistry, Graduate School for Molecular Materials and Nanochemistry, Gyeongsang National University, Jinju Gyeognam 660-701, Korea, Fax: +82-55-7721489, http://nongae.gsnu.ac.kr/~yjyoon/

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Eun Jung Kim

Eun Jung Kim

Department of Chemistry & Research Institute of Natural Sciences Department of Chemistry, Graduate School for Molecular Materials and Nanochemistry, Gyeongsang National University, Jinju Gyeognam 660-701, Korea, Fax: +82-55-7721489, http://nongae.gsnu.ac.kr/~yjyoon/

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Gi Hyeon Sung

Gi Hyeon Sung

Department of Chemistry & Research Institute of Natural Sciences Department of Chemistry, Graduate School for Molecular Materials and Nanochemistry, Gyeongsang National University, Jinju Gyeognam 660-701, Korea, Fax: +82-55-7721489, http://nongae.gsnu.ac.kr/~yjyoon/

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Jeum-Jong Kim

Jeum-Jong Kim

Advanced Solar Technology Research Department, Electronics and Telecommunications Research Institute, Daejeon 305-700, Korea

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Dong-Soo Shin

Dong-Soo Shin

Department of Chemistry, Changwon National University, Changwon, GN 641-773, Korea, Fax: +82-55-2133439

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Sang-Gyeong Lee

Sang-Gyeong Lee

Department of Chemistry & Research Institute of Natural Sciences Department of Chemistry, Graduate School for Molecular Materials and Nanochemistry, Gyeongsang National University, Jinju Gyeognam 660-701, Korea, Fax: +82-55-7721489, http://nongae.gsnu.ac.kr/~yjyoon/

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Yong-Jin Yoon

Yong-Jin Yoon

Department of Chemistry & Research Institute of Natural Sciences Department of Chemistry, Graduate School for Molecular Materials and Nanochemistry, Gyeongsang National University, Jinju Gyeognam 660-701, Korea, Fax: +82-55-7721489, http://nongae.gsnu.ac.kr/~yjyoon/

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First published: 09 April 2013
Citations: 7

Graphical Abstract

The regioselective consecutive multihalogenation of 2,2′-bithiophene as a model compound was demonstrated by using lithium halides and lead tetraacetate in chloroform in one pot. This method offers new possibilities for the control of the regioselectivity and the multiplicity in the halogenation of electron-rich aromatic compounds.

Abstract

The one-pot regioselective consecutive multihalogenation of 2,2′-bithiophene (1) was demonstrated. Compound 1 was consecutively halogenated with lithium halides such as lithium bromide, chloride, and/or iodide in the presence of lead tetraacetate in chloroform at room temperature or under reflux conditions to give 5-bromo(or chloro)-5′-iodo(or chloro)-, 3-bromo(or chloro)-5,5′-dibromo(or dichloro, diiodo)-, 3,3′-dibromo-(or dichloro)-5,5′-diiodo(or dibromo, dichloro)-, and 3,3′,5-tribromo(or trichloro)-5′-iodo(or bromo)-2,2′-bithiophenes. Notably, this process offers a regioselective method for consecutive multihalogenation in one pot, and the yields and selectivity are also higher than those obtained in the step-by-step and concurrent halogenation methods.