title: Benzo-21-crown-7/secondary ammonium salt [2]rotaxanes with fluoro/chlorocarbon blocking groups.
abstract: Three threaded structures capped by fluoro/chlorocarbon blocking groups with different sizes were constructed by template synthesis based on the benzo-21-crown-7/secondary ammonium salt recognition motif, as confirmed by (1)H NMR, electrospray mass spectrometry and single crystal X-ray analysis. The transformation from a rotaxane-like entity into a rotaxane was achieved by replacing the end group from the trifluoroacetic ester group to its trichloroacetic ester analogue.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zheng
authors.forename: Mingming
authors.initials: M
authors.lastname: Zhang
authors.forename: Shengyi
authors.initials: S
authors.lastname: Dong
authors.forename: Xuzhou
authors.initials: X
authors.lastname: Yan
authors.forename: Min
authors.initials: M
authors.lastname: Xue