反応 #10849

反応方程式

2,4-dimethoxy-benzaldehyde

iodine monochloride

hydrochloric acid

→

title compound

収率 87.5%

5-Iodo-2,4-dimethoxy-benzaldehyde

収率 87.5%

溶媒

methanol

methanol

反応条件

後処理

1. 1
   ろ過The resulting precipitate was collected by filtration
2. 2
   洗浄washed with water
3. 3
   その他dried in vacuo
4. 4
   その他The crude product was further recrystallized from a mixture of tetrahydrofuran and heptane (1:1

実験手順

To a solution of 2,4-dimethoxy-benzaldehyde (20.0 g, 120.4 mmol) in methanol (550 mL) was added a solution of iodine monochloride (23.25 g, 144.9 mmol) in methanol (60 mL) dropwise over 20 min. The solution was allowed to stir at ambient temperature for 3 hours and then poured into a solution of hydrochloric acid (0.5 M, 600 mL). The resulting precipitate was collected by filtration, washed with water, and dried in vacuo. The crude product was further recrystallized from a mixture of tetrahydrofuran and heptane (1:1, v/v) to give the title compound as a white solid (30.62 g, 87.5%), m.p. 170–172° C. 1H NMR (CDCl3) δ 10.19 (s, 1H), 8.22 (s, 1H), 6.39 (s, 1H), 3.97 (s, 3H), 3.95 (s, 3H).

出典