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Synthesis of cationic acyclic CB[n]-type container M2NH3. Conditions: a) CF3CO2H / Ac2O, 70 °C, 3 h, 36%, b) DMSO, NaN3, 80 °C, 12 h, 88%, c) DMSO, H2O, PPh3, 80 °C, 4h then HCl, 81%.