Synthesis of [2]-, [3]-, and [4]rotaxanes whose axis contains two bidentate and two tridentate chelates

Abstract

A [3]rotaxane consisting of two 30-membered rings threaded by a symmetrical filament-like fragment was synthesized thanks to the copper(I)-template effect. The filament incorporates two tridentate coordinating units and two bidentate chelating groups. In addition to the [3]rotaxane, two homologous compounds were isolated in very significant yields: the corresponding [2]- and [4]-rotaxanes containing the same thread as the [3]rotaxane and encompassing one or three rings respectively.