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Even if APTHF remains in the product, APTHF remained is removed during the purification process of PRX.
The efficiency of the solid-state end-capping reaction of PPRX obtained by solution process is high enough. However, the yield of PRX becomes low when the two step reaction was carried out in solid state. Therefore, it is obvious that the threading efficiency of APTHF into CD as the first process is low. Such low efficiency in heterogeneous system is well understandable, although we did not study the detailed reason for it.
We carried out the reaction of APHF with the end-capping agents (DNBC and DNFB) under the same conditions as a control experiment, and obtained the corresponding acylated products in 60% (DNBC) and 75% (DNFB), respectively.
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Liu, R., Harada, A. & Takata, T. Solvent-Free Synthesis of Unmodified Cyclodextrin-Based Pseudopolyrotaxane and Polyrotaxane by Grinding. Polym J 39, 21–23 (2007). https://doi.org/10.1295/polymj.PJ2006112
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DOI: https://doi.org/10.1295/polymj.PJ2006112