title: Polyethylated triptycene derivatives.
abstract: The octaethyl triptycenes 7 and 8 were synthesized by Diels-Alder reaction of the octaethylanthracene 4with the corresponding benzynes. Low-temperature NMR spectra of 7 and 8 are consistent with the presence of the fully alternated conformation "a" of C(2) symmetry. However, in the determined crystal structures, the compounds adopt a higher energy conformation with a pair of vicinal ethyls oriented in the same direction.
authors.affiliation: Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel.
authors.forename: Vered
authors.initials: V
authors.lastname: Marks
authors.forename: Moshe
authors.initials: M
authors.lastname: Nahmany
authors.forename: Hugo E
authors.initials: HE
authors.lastname: Gottlieb
authors.forename: Silvio E
authors.initials: SE
authors.lastname: Biali