“…After addition of HCl (6 m, 3 mL) the mixture was heated under reflux for 16 h. The white precipitate was filtrated off, washed with diethyl ether and dried in vacuo (0.72 g, 2.32 mmol, 85 %). (E)-4,4'-Bis(aminomethyl)-a,a'-dibromostilbene dihydrochloride (4): A mixture of 4,4'-dimethyltolane (1.15 g, 5.57 mmol, synthesized according to Drefahl et al [45] ), N-bromosuccinimide (4.07 g, 22.9 mmol), and AIBN (16 mg, 100 mmol) in CCl 4 (30 mL, distilled and dried over sieves) was heated under reflux for 4 d under N 2 . Additional portions of AIBN (3 8 mg, 50 mmol) were added daily.…”