Potassium Hydroxide → 1,1-Dimethylethyl 4-ethenylphenyl carbonate

HRID 1657218Notes

Reaction equation

HRID 1657218 reaction equation
C(OC1[CH:12]=[CH:11][C:8]([CH:9]=[CH2:10])=[CH:7][CH:6]=1)(=O)C.[OH-].[K+].[C:15]([O:22][C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])(OC(C)(C)C)=O>C(OCC)(=O)C.CO>[C:26]([O:25][C:23]([O:22][C:15]1[CH:10]=[CH:9][C:8]([CH:11]=[CH2:12])=[CH:7][CH:6]=1)=[O:24])([CH3:27])([CH3:28])[CH3:29]

Participants

6

Reactant 3

HCID 14797Potassium HydroxideHCID 758214-Ethenylphenyl acetateHCID 90495Di-tert-butyl dicarbonate

Product 1

HCID 934851,1-Dimethylethyl 4-ethenylphenyl carbonateYield 82%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
25 °C

Procedure

A solution of 751 grams (4.6 moles) of 4-acetoxystyrene in 3767 grams of ethyl acetate was charged to a 12-liter three-necked flask equipped with a mechanical stirrer, condenser, and ice-bath. A solution of 634 grams (0.8 moles) of potassium hydroxide in 1197 grams of methanol, and 1685 grams (7.6 moles) of molten di-tert-butyl dicarbonate was added in small portions to the stirred reaction mixture, over a period of 1 hour 20 minutes. The reaction temperature was maintained at 25° C. throughout the addition. The contents of the vessel were stirred an additional 1.4 hours at 25° C. The reaction slurry was washed twice with 4-liter portions of deionized water. The organic layer was vacuum stripped at 35° C. and 50 mm Hg until most of the solvent had been removed. the residue was further stripped at 75° C. and 1.5 mm Hg. The residual oil, 1015 grams (99.5% conversion and 82% yield, based on 4-acetoxystyrene) was vacuum distilled to yield pure 4-tertiary-butoxycarbonyloxystyrene. Yields observed in multiple experiments employing the above procedure are shown below. The method was not yet optimized in terms of all of the variables, which variables may have differed slightly from batch to batch, accounting for the range in yield.

Workup

  1. customequipped with a mechanical stirrer, condenser, and ice-bath
  2. washThe reaction slurry was washed twice with 4-liter portions of deionized water
  3. customstripped at 35° C.
  4. custom50 mm Hg until most of the solvent had been removed
  5. customwas further stripped at 75° C.
  6. distillationdistilled

Sources & evidence

ORD record
ord-7e9b6b36c25c447a88d4bdcc0665127c
Source dataset
uspto-grants-1993_10
Patent number
US05256809

Reaction notes

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