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A) Structure of ReP catalysts. EtRePBr: R=Et, L=Br, n=0; EtRePpic: R=Et, L=3-picoline, n=1 (PF6− counter-ion not shown); RePBr: R=H, L=Br, n=0; RePpic: R=H (isolated as neutral, mono-deprotonated species), L=3-picoline, n=0; B) ORTEP view of the molecular structure of EtRePBr determined by X-ray diffraction with thermal ellipsoids set at 50 % probability. H atoms and atom-labelling for C atoms omitted for clarity.
