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Against all odds: Two different cobalt catalyst systems led to the selective isomerization of 1,3‐dienes. In the case of the [CoBr2(py‐imine)]‐catalyzed reaction, the Z‐1,3‐diene was formed in a highly selective manner (see scheme). When the catalyst precursor [CoBr2(dpppMe2)] was applied, a double‐bond migration and selective isomerization towards the 2Z,4E‐configured 2,4‐dienes were observed
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