Scheme 2.
Reagents and conditions: (i) K2CO3, catalytic KI and 18-crown-6, dry acetonitrile, microwave: 150 Watt, 6.5 bar, 175 °C, 45 min (100 Watt, 140 °C, 3 h: 2g, 2h, 2t, 2u, 2v, 2w), n = 3-5; R = H; C1-C4.
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