(E)-5-(2,5-dimethoxy-3,4,6-trimethylphenyl)-3-methyl-2-pentenyl benzoate → (E)-3-methyl-5-(2,4,5-trimethyl-3,6-dioxo-1,4-cyclohexadien-1-yl)-2-pentenyl benzoate

HRID 1195472Notes

Reaction equation

HRID 1195472 reaction equation
[C:1]([O:9][CH2:10]/[CH:11]=[C:12](\[CH3:28])/[CH2:13][CH2:14][C:15]1[C:20]([CH3:21])=[C:19]([O:22]C)[C:18]([CH3:24])=[C:17]([CH3:25])[C:16]=1[O:26]C)(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>O.C(#N)C>[C:1]([O:9][CH2:10]/[CH:11]=[C:12](\[CH3:28])/[CH2:13][CH2:14][C:15]1[C:16](=[O:26])[C:17]([CH3:25])=[C:18]([CH3:24])[C:19](=[O:22])[C:20]=1[CH3:21])(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

4

Reactant 1

HCID 86745747(E)-5-(2,5-dimethoxy-3,4,6-trimethylphenyl)-3-methyl-2-pentenyl benzoate

Product 1

HCID 67900681(E)-3-methyl-5-(2,4,5-trimethyl-3,6-dioxo-1,4-cyclohexadien-1-yl)-2-pentenyl benzoateYield 73.7%

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 6342AcetonitrileSolvent

Procedure

A solution of ceric ammonium nitrate (7.2 g; 13.1 mmol) in water (30 ml) was added dropwise while cooling with ice to a solution of (E)-5-(2,5-dimethoxy-3,4,6-trimethylphenyl)-3-methyl-2-pentenyl benzoate (2 g; 5.2 mmol) in acetonitrile (30 ml). After completion of the addition the mixture was diluted with water and extracted with chloroform. The extracts were washed with water, dried and freed from solvent. The residue crystallizes spontaneously and 1.35 g of (E)-3-methyl-5-(2,4,5-trimethyl-3,6-dioxo-1,4-cyclohexadien-1-yl)-2-pentenyl benzoate was obtained. M.P, 74.5°-75.5° C.

Workup

  1. additionAfter completion of the addition the mixture
  2. extractionextracted with chloroform
  3. washThe extracts were washed with water
  4. customdried
  5. customThe residue crystallizes spontaneously

Sources & evidence

ORD record
ord-673068a0194047c58e76f7f6f95cdaee
Source dataset
uspto-grants-1992_05
Patent number
US05110955

Reaction notes

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