“…ω,ω′-Diether M2b was separated by "Kugelrohr" distillation (180 °C, 1 × 10 −3 mbar) to give 5.14 g (75%) of the pure product. 1 H NMR (500.1 MHz, CDCl 3 ): δ (ppm) = 5.73 (ddt, J = 17.1, 10.3, 6.7 Hz, 2 H, CHCH 2 ), 4.91 (dd, J = 17.1, 1.9 Hz, 2 H, CHCH a H b ), 4.84 (dd, J = 10.3, 1.9 Hz, 2 H, CHCH a H b ), 3.43 (t, J = 6.5 Hz, 4H, OCH 2 ), 3.32 (t, J = 6.7 Hz, 4 H, OCH 2 ), 1.96 (dt, J = 7.2, 6.7 Hz, 4H, CH 2 CHCH 2 ), 1.76 (tt, J = 6.5, 6.3 Hz, 2H, OCH 2 CH 2 CH 2 O), 1.49-1.44 (m, 4H, CH 2 CH 2 O), 1.33-1.25 (m, 4H, CH 2 ), 1.25-1.17 (m, 20H, CH 2 ); 13…”