Phosphorus oxychloride → Ethyl 4-(chlorosulfonyl)benzoate

HRID 1795211

Reaction equation

HRID 1795211 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[CH:11]=[CH:10][C:9]([S:12]([O-:15])(=O)=[O:13])=[CH:8][CH:7]=1)=[O:5])[CH3:2].[K+].O=P(Cl)(Cl)[Cl:19]>C(#N)C.S1(CCCC1)(=O)=O>[CH2:1]([O:3][C:4]([C:6]1[CH:11]=[CH:10][C:9]([S:12]([Cl:19])(=[O:15])=[O:13])=[CH:8][CH:7]=1)=[O:5])[CH3:2]

Participants

5

Reactant 2

HCID 24813Phosphorus oxychlorideHCID 23668296Potassium 4-ethoxycarbonylbenzenesulfonate

Product 1

HCID 3667622Ethyl 4-(chlorosulfonyl)benzoate

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 31347SulfolaneSolvent

Conditions

Temperature
75 °C

Procedure

A round bottom flask, fitted with a magnetic stir bar and a hose adapter connected to a source of nitrogen gas, was charged with a solution of potassium 4-ethoxycarbonylbenzenesulfonate (75.1 g) dissolved in a 3:1 (v/v) mixture of acetonitrile (300 mL) and sulfolane (100 mL). As the solution was stirred, POCl3 (55 mL) was added slowly and the stirring mixture was heated at 75° C. under a nitrogen atmosphere for 3 hours. The heterogeneous reaction mixture was allowed to cool to room temperature and was then concentrated using a rotary evaporator. The flask was then cooled in an ice bath and ice was added to the mixture in the flask. The product crystallized as a white solid and was filtered and washed with cold deionized water. The product was dried under vacuum at room temperature and 3 mmHg for 2 hours to afford 76 g of white solid.

Workup

  1. customA round bottom flask, fitted with a magnetic stir bar and a hose adapter
  2. temperatureto cool to room temperature
  3. concentrationwas then concentrated
  4. customa rotary evaporator
  5. temperatureThe flask was then cooled in an ice bath
  6. additionice was added to the mixture in the flask
  7. customThe product crystallized as a white solid
  8. filtrationwas filtered
  9. washwashed
  10. customThe product was dried under vacuum at room temperature

Sources & evidence

ORD record
ord-ddb8f09d53d54d64adc7f31cff430ff6
Source dataset
uspto-grants-2006_04
Patent number
US07026367B2

Linked notes

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