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Calixarenes as Stoppers in Rotaxanes

✍ Scribed by Claudia Fischer; Martin Nieger; Oliver Mogck; Volker Böhmer; Rocco Ungaro; Fritz Vögtle

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
561 KB
Volume
1998
Category
Article
ISSN
1434-193X

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✦ Synopsis

The synthesis of the amide-based rotaxane 7a bearing calix-1a by its size. Rotaxane formation of 8b was observed only by MALDI-TOF mass spectrometry of the reaction mixture of [4]arene blocking groups is described for the first time. While rotaxane formation fails if a calix [4]arene is functionalized at the amine 5b, the axle 6 and 1a. With the larger trimeric wheel 1b no stable rotaxane could be obtained. It either does the upper rim with only an amino or methylamino group lakking any spacer, the prolonged amine 5a works successfully not act as a concave template or its opening is too wide, even for the bulky calixarene stoppers. as stopper unit preventing dethreading of the dimeric wheel

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