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Tatsuro Asai, Atsushi Takata, Dr. Aiichiro Nagaki and Prof. Dr. Jun-ichi Yoshida Cover Picture: Practical Synthesis of Photochromic Diarylethenes in Integrated Flow Microreactor Systems (ChemSusChem 2/2012) ChemSusChem 5

Version of Record online: 15 FEB 2012 | DOI: 10.1002/cssc.201290004

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The synthesis of photochromic diarylethenes involves generating heteroaryllithium compounds by a halogen–lithium exchange reaction of heteroaryl halides, and subsequent reaction with octafluorocyclopentene. In a conventional batch macroreactor the reaction should be carried out at temperatures of −78 °C or lower, because heteroaryllithium compounds are often unstable and decompose at higher temperatures. The front cover features research by Jun-ichi Yoshida et al. (page 339), who report a practical method for the synthesis of photochromic diarylethenes by using integrated flow microreactor systems. Reactions can be conducted without using cryogenic conditions by virtue of effective temperature and residence-time control. Moreover, the synthesis of unsymmetrical diarylethenes, which is difficult to achieve using conventional batch macro systems, is accomplished.

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