Pseudo-polyrotaxane structures

Figure 33 (a) Sketch of a pseudo-polyrotaxane from a bis(biphenyl-phenylene) cyclophane threaded on phenylene-l,4-bis(oxy(oligoethyleneoxy)carbonic acid), (b) Space filling model, calculated from crystal structure data [385], With permission of Wiley-VCH... 

An alternative approach for the preparation of CD-based polyrotaxane using photoreactions is described (Scheme 9). The authors prepared a-CD-based polyrotaxanes by capping ends of a-CD-PPG complexes, in a pseudo-poly-rotaxane structure, with covalently bound stoppers. A polyrotaxane containing a number of /3-CD molecules was prepared by photoreactions of a precursor complex between /3-CD with PPG having a triphenyhnethyl group at... 

---