Sulfuric Acid → 2,5-Bishydroxymethyl-2',5'-dimethylbiphenyl

HRID 990176ノート

反応式

HRID 990176 の反応式
[H-].[H-].[H-].[H-].[Li+].[Al+3].[CH3:7][C:8]1[CH:13]=[CH:12][C:11]([CH3:14])=[CH:10][C:9]=1[C:15]1[CH:25]=[C:24]([C:26](OCC)=[O:27])[CH:23]=[CH:22][C:16]=1[C:17](OCC)=[O:18].S(=O)(=O)(O)O>C1COCC1>[OH:18][CH2:17][C:16]1[CH:22]=[CH:23][C:24]([CH2:26][OH:27])=[CH:25][C:15]=1[C:9]1[CH:10]=[C:11]([CH3:14])[CH:12]=[CH:13][C:8]=1[CH3:7]

参加物

5

反応物 3

HCID 1118Sulfuric AcidHCID 18676609Diethyl 2-(2',5'dimethylphenyl)terephthalateHCID 21226445Aluminium lithium hydride

生成物 1

HCID 184199172,5-Bishydroxymethyl-2',5'-dimethylbiphenyl

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒3 回

反応条件

温度
67 °C

実験手順

LiAlH4 (7.9 g, 208 mmol) was added to about 250 ml of THF under a blanket of argon. Diethyl 2-(2′,5′-dimethylphenyl)terephthalate (48.6 g, 149 mmol) (cf. C3) was diluted in a dropping funnel with about 60 ml of THF and was slowly added dropwise. The reaction mixture was vigorously stirred during this addition. The mixture was diluted with a further 100 ml of THF and was then refluxed at 67° C. After 2 hours, the mixture was cooled to RT. While cooling on a water bath and under a blanket of argon, ice water was added dropwise until gas evolution had ceased. Dilute (10% strength) sulfuric acid was subsequently added dropwise until the turbid gray mixture became clear. The phase mixture was separated by generous addition of chloroform and the aqueous phase was subsequently shaken twice with chloroform. The organic phases were shaken once with H2O and evaporated. The crude product was recrystallized from chloroform/hexane: 24.7 g (68%) of colorless, microcrystalline powder; melting point: 145-148° C. (purity>95%).

後処理

  1. additionwas slowly added dropwise
  2. temperaturethe mixture was cooled to RT
  3. additionwas added dropwise until gas evolution
  4. additionwas subsequently added dropwise until the turbid gray mixture
  5. customThe phase mixture was separated by generous addition of chloroform
  6. stirringthe aqueous phase was subsequently shaken twice with chloroform
  7. stirringThe organic phases were shaken once with H2O
  8. customevaporated
  9. customThe crude product was recrystallized from chloroform/hexane

出典と根拠

ORDレコード
ord-e45dee0d00f24d2dafa0cf5ebd67da6c
出典データセット
uspto-grants-2002_10
特許番号
US06458909B1

反応ノート

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