Scheme 14.
An ammonium/triazolium-containing pH-sensitive molecular muscle. Reagents and conditions: a) 1) mannosyl azide (pictured), Cu(CH3CN)4PF6, lutidine, 2) CH3I then NH4PF6; b) NaOH (aq)/CH2Cl2; c) 1) HCl/Et2O, 2) NH4PF6.
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