title: Diels-Alder additions of benzynes within helicene skeletons.
abstract: Although the contortions required are unprecedented, the benzynes formed by the fluoride-induced elimination of TMSOTf from o-trimethylsilyl [6]- and [7]-helicenol triflates add to another ring of the helicenes rather than to an external furan molecule.
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA.
authors.forename: David Zhigang
authors.initials: DZ
authors.lastname: Wang
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Katz
authors.forename: James
authors.initials: J
authors.lastname: Golen
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold