The tris(2-thienyl)methyl cation 2a+ is stabilized by delocalization over a conjugated polymethine framework; it shows restricted rotation about the C–S bond induced by S–S interaction and crystallizes as a statistically disordered racemic mixture of two enantiomeric species.
T. Varea, M. Medio-Simón, B. Abarca, R. Ballesteros, G. Asensio, S. García-Granda, E. Pérez-Carreño and F. Gómez-Beltrán, J. Chem. Soc., Chem. Commun., 1993, 1476 DOI: 10.1039/C39930001476
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