Scheme3.
Synthesis of the [2]catenanes 16⋅Cl and 16⋅PF6. Reagents and conditions: i) Et3N, CH2Cl2, RT, 2 h, 30 %; ii) AgNO3, DMSO/H2O, RT, 45 min; iii) NH4PF6(aq), 73 %.
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