Divergent Reactivity of 2-Vinylpyridine and 1-Vinylpyrazole in Rhodium-Phosphine Systems: C-H Activation and Dinuclear Chemistry

Ramón Azpíroz, Vincenzo Passarelli, Ricardo Castarlenas, Jesús J. Pérez-Torrente, Luis A. Oro

Abstract


The RhI-RhIII mixed valence dinuclear complex Rh2-Cl2(μ-H)(μ-η22-C,N-NC5H4-2-(Z)CH=CH)(PPhMe2)3 has been prepared by reaction of [Rh(μ-Cl)(η2-coe)2]2 with 2-vinylpyridine in the presence of dimethylphenylphosphine as a result of C-H activation of the terminal olefinic proton. The X-ray structure presents anagostic Rh···HC and π-π interactions between aromatic rings. In contrast, 1-vinylpyrazole does not undergo a C-H activation process, resulting in the formation of dinuclear species supported by 1-vinylpyrazole bridges. Anagostic Rh···HC interactions and CH···Cl hydrogen bonds are responsible for the 3D packing of the complex.

Keywords


C-H Activation; Vinylpyridine; Vinylpyrazole; Rhodium; Dinuclear Complexes.

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Copyright (c) 2017 Ramón Azpíroz, Vincenzo Passarelli, Ricardo Castarlenas, Jesús J. Pérez-Torrente, Luis A. Oro

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