反応 #640549

反応方程式

methyl 2-methyl-4-trimethylsilyloxybenzoate

LiOH

HCl

→

2-methyl-4-hydroxybenzoic acid

収率 31.6%

溶媒

—

ethyl acetate hexanes

methanol

water

反応条件

後処理

1. 1
   その他A 100 mL round bottom flask equipped with magnetic stir bar
2. 2
   温度After 2 hours at reflux the reaction
3. 3
   抽出Extraction with ethyl acetate
4. 4
   濃縮followed by concentration in vacuo
5. 5
   その他gave a crude solid (70:30) product

実験手順

A 100 mL round bottom flask equipped with magnetic stir bar was charged with 5.7 g methyl 2-methyl-4-trimethylsilyloxybenzoate and 2.0 g LiOH in 40 mL methanol and 10 mL water. After 2 hours at reflux the reaction was poured into 10 mL concentrated HCl and then 100 g ice. Extraction with ethyl acetate followed by concentration in vacuo gave a crude solid (70:30) product:starting material. Flash Chromatography using 50-50 ethyl acetate/hexanes as an eluent gave 1.15 g 2-methyl-4-hydroxybenzoic acid, m/e=193(M+H).

出典