ChemSusChem

Cover image for Vol. 7 Issue 8

Editor-in-Chief: Guido Kemeling; Editorial Board Chairs: Matthias Beller, Gabriele Centi, Licheng Sun

Impact Factor: 7.117

ISI Journal Citation Reports © Ranking: 2013: 17/148 (Chemistry Multidisciplinary)

Online ISSN: 1864-564X

Associated Title(s): Angewandte Chemie International Edition, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemCatChem, ChemElectroChem, ChemPhysChem, Energy Technology

5_02/2012Cover Picture: Practical Synthesis of Photochromic Diarylethenes in Integrated Flow Microreactor Systems (ChemSusChem 2/2012)

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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