Acetic Acid → 4,4'-Dihydroxy-3-biphenylcarboxylic acid

HRID 1838785ノート

反応式

HRID 1838785 の反応式
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][C:11]([O:14]C)=[CH:10][CH:9]=2)=[CH:4][C:3]=1[C:16]([OH:18])=[O:17].C(O)(=O)C.Br>[Br-].C([P+](CCCC)(CCCC)CCCC)CCC.O>[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][C:11]([OH:14])=[CH:12][CH:13]=2)=[CH:4][C:3]=1[C:16]([OH:18])=[O:17]

参加物

6

反応物 3

HCID 176Acetic AcidHCID 260Hydrogen BromideHCID 51971334-Hydroxy-4′-methoxy[1,1′-biphenyl]-3-carboxylic acid

生成物 1

HCID 234484124,4'-Dihydroxy-3-biphenylcarboxylic acid収率 48.3%

試薬・触媒・溶媒 2

HCID 76564Tetrabutylphosphonium bromide触媒HCID 962Water溶媒

実験手順

A solution of 4-hydroxy-4′-methoxy-3-biphenylcarboxylic acid (5.3 g; 21.6 mmol), tetrabutylphosphonium bromide (0.8 g; 2.3 mmol), acetic acid (35 ml) and hydrobromic acid (35 ml of a 48% solution) was heated at reflux for 6 h. The reaction mixture was cooled and poured into water (400 ml). The resulting precipitate was isolated and recrystallised from ethyl acetate to give 2.4 g (47%) of 4,4′-dihydroxy-3-biphenyl-carboxylic acid.

後処理

  1. temperatureat reflux for 6 h
  2. temperatureThe reaction mixture was cooled
  3. customThe resulting precipitate was isolated
  4. customrecrystallised from ethyl acetate

出典と根拠

ORDレコード
ord-a8468112a53940b59cdcc25b28d54e59
出典データセット
uspto-grants-2004_01
特許番号
US06676851B1

反応ノート

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