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. 2017 Apr 24;7:46056. doi: 10.1038/srep46056

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The outsphere perchlorate anions have been omitted for clarity. Reagents are as follows: (a) (CH₃)₂CHI, anhydrous K₂CO₃ and ethanol (reflux, 12 h); (b) Pb(CH₃COO)₄, AcOH (75 °C, 8 h); (c) CH₃COOH/H₂SO₄ (96:4) (N₂, 75 °C, 20 h); (d) MeOH/CHCl₃ (4:1) for 1 and 3; MeOH/H₂O (4:1) for 2, (80 °C, 72 h).