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Elsevier B.V..
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Invited for the cover of this issue is Valentine P. Ananikkov and co-workers. The image depicts the dynamic behaviour of a Pd/NHC catalytic system with easy transition from molecular to ionic complex. Read the full text of the article at 10.1002/chem.201903221. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim