title: Using "threading followed by shrinking" to synthesize highly stable dialkylammonium-ion-based rotaxanes.
abstract: Herein, we report a "threading followed by shrinking" approach for the synthesis of rotaxanes by using an "oxygen-deficient" macrocycle that contained two arylmethyl sulfone units and the dumbbell-shaped salt bis(3,5-dimethylbenzyl)ammonium tetrakis(3,5-trifluoromethylphenyl)borate as the host and guest components, respectively. The extrusion of SO2 from both of the arylmethyl sulfone units of the macrocyclic component in the corresponding [2]pseudorotaxane resulted in a [2]rotaxane that was sufficiently stable to maintain its molecular integrity in CD3 SOCD3 at 393 K for at least 5 h.
authors.affiliation: Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, Taiwan 10617, R.O.C.
authors.forename: Liang-Yun
authors.initials: LY
authors.lastname: Wang
authors.forename: Jia-Ling
authors.initials: JL
authors.lastname: Ko
authors.forename: Chien-Chen
authors.initials: CC
authors.lastname: Lai
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