title: Modular synthesis of bipyridinium oligomers and corresponding donor-acceptor oligorotaxanes with crown ethers.
abstract: Donor-acceptor [4]- and [6]rotaxanes have been prepared from bipyridinium (BIPY(2+)) oligomers and 1,5-dinaphtho[38]crown-10 (DN38C10) by a threading-followed-by-stoppering protocol employing click chemistry. An efficient, straightforward route to the BIPY(2+) oligomers has been developed that requires little to no chromatographic purification. Unlike most donor-acceptor oligorotaxanes that have been reported to date, 100% of the recognition sites on the dumbbells are occupied by rings.
authors.affiliation: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
authors.forename: Chris M
authors.initials: CM
authors.lastname: Gothard
authors.forename: Carson J
authors.initials: CJ
authors.lastname: Bruns
authors.forename: Nosheen A
authors.initials: NA
authors.lastname: Gothard
authors.forename: Bartosz A
authors.initials: BA
authors.lastname: Grzybowski
authors.forename: J Fraser
authors.initials: JF
authors.lastname: Stoddart