Tetrahedron Letters p. 6641 - 6644 (1998)
Update date:2022-08-23
Topics:
Gano, James E.
Kirschbaum, Kristin
Luzik Jr., Eddie D.
Sekher, Padmanabhan
Twist-twist, pi conjugated, TTPC, systems are described. The twisted stilbene motif represented by 2,2,5,5-tetramethyl-3,4-diphenylhex-3-ene is extended to systems with five and seven perpendicular pi systems. UV spectra show extension of the chain imparts a regular red shift to the prominent π→π* transition. The shift is attenuated compared to planar pi conjugated systems. Extended TTPC systems occur as mixtures of atropisomers with very similar energies.
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