Radical Dimerization of 5,5′‐Diphenyl‐3,3′,4,4′‐tetramethoxy‐2,2′‐bipyrrole: π Dimer in the Crystal, σ Dimer in Solution.
1999
The crystalline, spinless π dimer (1.+⋅PF6)2 was obtained by the oxidation of bipyrrole 1 with ferrocenium hexafluorophosphate. The diamagnetic species generated electrochemically in solution was identified as the σ dimer by NMR spectroscopy.
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