title: Mild and high-yielding syntheses of diethyl phosphoramidate-stoppered [2]rotaxanes.
abstract: The mild and efficient reaction between triethyl phosphite and benzylic azides allows us not only to construct rotaxanes in high yield from dibenzo[24]crown-8 (DB24C8) and dibenzylammonium (DBA(+))-derived threads but also to incorporate di(p-toluidine)[24]crown-8, which binds DBA(+) ions much more weakly than does DB24C8, into a corresponding [2]rotaxane.
authors.affiliation: Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan 10617, R.O.C.
authors.forename: Wei-Chung
authors.initials: WC
authors.lastname: Hung
authors.forename: Kang-Shyang
authors.initials: KS
authors.lastname: Liao
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Liu
authors.forename: Shie-Ming
authors.initials: SM
authors.lastname: Peng
authors.forename: Sheng-Hsien
authors.initials: SH
authors.lastname: Chiu