Methanol → Benzoic acid, 3,5-dimethyl-, methyl ester

HRID 1742906

反応式

HRID 1742906 の反応式
[CH3:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([CH3:11])[CH:10]=1)[C:5]([OH:7])=[O:6].S(=O)(=O)(O)O.[CH3:17]O>>[CH3:17][O:6][C:5](=[O:7])[C:4]1[CH:8]=[C:9]([CH3:11])[CH:10]=[C:2]([CH3:1])[CH:3]=1

参加物

4

反応物 3

HCID 887MethanolHCID 1118Sulfuric AcidHCID 103563,5-Dimethylbenzoic acid

生成物 1

HCID 32786Benzoic acid, 3,5-dimethyl-, methyl ester収率 90%

実験手順

A solution of 3,5-dimethyl benzoic acid (25 g, 0.17 mol) in methanol (250 ml) was treated with sulfuric acid (1 ml, cat. amount) and heated to reflux. After 10 hours, the solution was cooled to room temperature, concentrated to approximately 1/2 volume and poured into 200 ml of crushed ice. The mixture was extracted twice with 200 ml portions of diethyl ether. The organic phase was extracted with saturated aqueous sodium carbonate, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting solid was recrystallized from hexanes to yield the product (24.5 g, 90% yield) as volatile white plates. mp=32°-35° C. (lit. mp=35°-36° C.)

後処理

  1. temperatureheated to reflux
  2. concentrationconcentrated to approximately 1/2 volume
  3. additionpoured into 200 ml of crushed ice
  4. extractionThe mixture was extracted twice with 200 ml portions of diethyl ether
  5. extractionThe organic phase was extracted with saturated aqueous sodium carbonate
  6. dry with materialdried over magnesium sulfate
  7. concentrationconcentrated under reduced pressure
  8. customThe resulting solid was recrystallized from hexanes

出典と根拠

ORDレコード
ord-ad93ea5c76c945df88ea026eaa9d609c
出典データセット
uspto-grants-1994_08
特許番号
US05342934

関連ノート

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