Molecular structure and intramolecular motion of (E)-stilbenes in crystals. An interpretation of the unusually short ethylene bond

Article abstract of DOI:10.1021/ja00029a037

Crystal structures of (E)-2,2′-dimethylstilbene (2), (E)-2,2′4,4′-tetramethylstilbene (3), (E)-2,2′,5,5′-tetramethylstilbene (4), (E)-2,2′,4,4′,5,5′-hexamethylstilbene (5), and (E)-2,2′,3,3′-tetramethylstilbene (6) were determined at several temperatures