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Synthesis of 2-2’ bridged bis(β-CDs). Reaction conditions: 1) TBDMSCl, imidazole, dry pyridine, stirring rt, 8 h; 2) 5-bromopentane, LiH, dry THF–DMSO, reflux, 4 h; 3) acetic anhydride, dry pyridine, MW, 50 °C, 1 h; 4) Grubbs’ catalyst, Ar, dry CH2Cl2, US, 34 °C; 5) KOH, 2 M, MeOH, H2O; US; 40 °C, 30 min; 6) AcCl 2% in MeOH; CH2Cl2, MW, reflux, 15 min.
