title: Easy Synthesis of Functionalized Hetero[7]helicenes.
abstract: Hetero[7]helicenebisquinones can be synthesized easily on a multigram scale by combining the silyl enol ethers of 3,6-diacetyldibenzofuran, 3,6-diacetyldibenzothiophene, and 3,6-diacetylcarbazole with p-benzoquinone. They can be resolved into their enantiomers by a procedure that had previously been used to resolve carbohelicenebisquinones. Their absolute configurations are assigned.
authors.affiliation: Department of Chemistry, Columbia University, New York, New York, 10027.
authors.forename: Spencer D.
authors.initials: SD
authors.lastname: Dreher
authors.forename: Daniel J.
authors.initials: DJ
authors.lastname: Weix
authors.forename: Thomas J.
authors.initials: TJ
authors.lastname: Katz