T. Varea et al., STABILIZATION OF THE TRIS(2-THIENYL)METHYL CATION BY FORMATION OF POLYMETHINE UNITS - A THIOPHENE S-S INTRAMOLECULAR INTERACTION, Journal of the Chemical Society, Chemical Communications, (19), 1993, pp. 1476-1477
The tris(2-thienyl)methyl cation 2a+ is stabilized by delocalization o
ver a conjugated polymethine framework; it shows restricted rotation a
bout the C-S bond induced by S-S interaction and crystallizes as a sta
tistically disordered racemic mixture of two enantiomeric species.