Glyoxylic Acid → 5,7-Di-tert-butyl-3-hydroxy-2-benzofuranone

HRID 977423Notes

Reaction equation

HRID 977423 reaction equation
[C:1]([C:5]1[CH:10]=[C:9]([C:11]([CH3:14])([CH3:13])[CH3:12])[CH:8]=[CH:7][C:6]=1[OH:15])([CH3:4])([CH3:3])[CH3:2].[C:16](O)(=[O:19])[CH:17]=[O:18].O.C1(C)C=CC(S(O)(=O)=O)=CC=1.O>ClCCCl>[C:11]([C:9]1[CH:10]=[C:5]([C:1]([CH3:4])([CH3:3])[CH3:2])[C:6]2[O:15][C:17](=[O:18])[CH:16]([OH:19])[C:7]=2[CH:8]=1)([CH3:14])([CH3:13])[CH3:12]

Participants

6

Reactant 4

HCID 760Glyoxylic AcidHCID 962WaterHCID 73112,4-Di-tert-butylphenolHCID 521998p-Toluenesulfonic acid monohydrate

Product 1

HCID 68508215,7-Di-tert-butyl-3-hydroxy-2-benzofuranone

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

A mixture of 21.2 g (0.10 mol) of 2,4-di-tert-butylphenol (97%), 16.3 g (0.11 mol) of 50% aqueous glyoxylic acid and 0.05 g (0.26 mmol) of p-toluenesulfonic acid monohydrate in 30 ml of 1,2-dichloroethane is refluxed under nitrogen for 3.5 hours on a water separator. Afterwards the reaction mixture is concentrated on a vacuum rotary evaporator. The residue is taken up in 80 ml of hexane and washed three times with water. The aqueous phases are separated in the separating funnel and further extracted with 30 ml of hexane. The organic phases are combined, dried over magnesium sulfate and concentrated on a vacuum rotary evaporator. The residue yields 26.23 g (~100%) of analytically pure 5,7-di-tert-butyl-3-hydroxy-3H-benzofuran-2-one in the form of a thick yellowish resin (compound (101 ), Table 1).

Workup

  1. concentrationAfterwards the reaction mixture is concentrated on a vacuum rotary evaporator
  2. washwashed three times with water
  3. customThe aqueous phases are separated in the separating funnel
  4. extractionfurther extracted with 30 ml of hexane
  5. dry with materialdried over magnesium sulfate
  6. concentrationconcentrated on a vacuum rotary evaporator

Sources & evidence

ORD record
ord-86e97dde2ee24464b4671c632a4b0d47
Source dataset
uspto-grants-1997_03
Patent number
US05614572

Reaction notes

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