反应 #51206

反应方程式

HCl

paraformaldehyde

3-methyl-phenol

SnCl4

→

title product

收率 25.5%

2-Hydroxy-4-methyl-benzaldehyde

收率 25.5%

溶剂

water

toluene

反应条件

后处理

1. 1
   萃取The solution was extracted with ether (25 ml)
2. 2
   洗涤washed with brine (20 ml)
3. 3
   干燥dried (MgSO4)
4. 4
   过滤filtered
5. 5
   其他evaporated to a brown oil
6. 6
   其他This oil was purified by column chromatography

实验过程

To a stirred solution of 3-methyl-phenol (1 g, 9.2 mmol) in toluene (5 ml) at room temperature under nitrogen was added SnCl4 (241 mg, 0.92 mmol) and tri-nbutylamine (0.6 ml, 2.77 mmol). After 20 min, paraformaldehyde (611 mg, 20.3 mmol) was added and the whole stirred at 100° C. for 16 h. The reaction mixture was diluted with water (20 ml) and acidified with 2N HCl to pH2. The solution was extracted with ether (25 ml), washed with brine (20 ml), dried (MgSO4) filtered and evaporated to a brown oil. This oil was purified by column chromatography using 5% EtOAc in pentane as eluant to provide the title product (319 mg, 25%); 1HNMR (400 MHz, CDCl3) δ: 2.3 (s, 3H), 6.75 (m, 2H), 7.35 (d, 1H), 9.75 (s, 1H), 11.00 (s, 1H).

来源