Einstufige Synthese eines vierfach funktionalisierten Catenans

Abstract

Eine der einfachsten Catenansynthesen ist die hier beschriebene Umsetzung zum Tetramethoxycatenan 1 (ROCH3),das konformativ weniger beweglich ist als das bkannte unsubstituierte Catenan (R = H): Die zwei OCH3‐Signale im 1H‐NMR‐‐Spektrum von 1 werden auf das Vorliegen von inneren und äußeren OCH3=Gruppen zurückgeführt.

A Modular “Toolbox” Approach to Flexible Branched Multimacrocyclic Hosts as Precursors for Multiply Interlocked Architectures

“…Our FBMHs are based on the well-known Hunter-Vçgtle tetralactam macrocycle, which was reported by Hunter [9] and Vçgtle et al [10] Since these macrocycles provide four converging hydrogen bonds for interaction with guests, [11] they have been frequently applied in templated, high-yield syntheses of mechanically interlocked molecules, such as (pseudo-)rotaxanes and catenanes. [12,13] Another advantage is that tetralactam macrocycles provide high chemical stability under many reaction conditions.…”

Calixarenes as Stoppers in Rotaxanes

“…Under the yl)cyclohexane. In contrast to the isophthaloyl dichloride same conditions the synthesis of a rotaxane using 3b and employed in the cyclization [14] , the tert-butyl analogue has the "trimer" 1b failed. the advantage to prevent here any formation of catenane…”

Templates, “Wheeled Reagents”, and a New Route to Rotaxanes by Anion Complexation: The Trapping Method

“…In contrast, in the above case ( Figure 2a) the wheel is one of the ligands of the template and the latter, the copper(i) cation, does not become an integral part of the rotaxane framework. The lactam/amide recognition motif as shown in Figure 2c was originally applied to catenane synthesis independently and in a slightly different way by the groups of Hunter [16] and Vögtle [17] and then modified by the latter for rotaxanes. [18] Hydrogen bonding of this type has likewise been employed for clipping syntheses.…”