The crystal and molecular structure of 2,3,5,6- tetraphenyl-1,4-dithiin
Elsevier for The Japan Institute of Heterocyclic Chemistry
The phenyl rings in 2,3,5,6-tetraphenyl-1,4-dithiin have neither of the two most obvious configurations: all perpendicular to the dithiin ring (paddlewheel), or parallel to the dithiin double bonds (butterfly). Instead, there are two phenyls in each orientation.
Ian W. Jones and Patrick E. Hoggard, "The crystal and molecular structure of 2,3,5,6- tetraphenyl-1,4-dithiin", Heterocycles 57, 353-356 (2002).