*(1E,6E)-4,4-Diallyl-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta-1,6-diene-3,5-dione* (**6m**)

Yield: 85%; mp = 160–162 ◦C; 1H-NMR (CDCl3) δ 7.65 (d, *J* = 15.5 Hz, 2H), 7.06 (dd, *J* = 8.3, 1.5 Hz, 2H), 6.95 (d, *J* = 2.0 Hz, 2H), 6.85 (d, *J* = 8.0 Hz, 2H), 6.61 (d, *J* = 15.5 Hz, 2H), 5.87 (s, 2H), 5.54–5.49 (m, 2H), 5.07–5.04 (m 4H), 3.88 (s, 6H), 2.78 (d, *J* = 7.5 Hz, 4H); 13C-NMR (CDCl3) δ 194.6, 148.7, 146.8, 144.6, 132.3, 126.7, 119.3, 119.1, 114.7, 109.7, 67.8, 56.1, 34.4; HRMS [ESI]<sup>+</sup> calculated for C27H24NaO6: 467.1471 [M + Na]+; found: 467.1477.
