Hydrochloric Acid → HCID 20528482, compound

HRID 67141Notes

Reaction equation

HRID 67141 reaction equation
[NH2:1][CH:2]([CH3:16])[CH:3]([N+:13]([O-])=O)[CH2:4][C:5]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)=[O:6].S(S([O-])=O)([O-])=O.[Na+].[Na+].Cl.S(=O)=O>O1CCOCC1.O>[NH2:13][CH:3]([CH:2]([NH2:1])[CH3:16])[CH2:4][C:5]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)=[O:6]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 1119Sulfur DioxideHCID 24489Sodium DithioniteHCID 20528473HCID 20528473, compound

Product 1

HCID 20528482HCID 20528482, compound

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 312751,4-DioxaneSolvent

Procedure

A suspension of 3.9 g of 4-amino-3-nitro-valerophenone in 35 ml of dioxane and 9 ml of water is heated to the reflux temperature and the resulting solution is treated, in the course of 10 minutes, while boiling, with 14 g of sodium dithionite in 60 ml of water. The reaction mixture is boiled under reflux for a further 15 minutes and 6 N hydrochloric acid is then added dropwise until the pH is 3, a little sulphur dioxide escaping. The pH value is adjusted to 2, the mixture is allowed to react for a few minutes and the organic solvent is then removed under reduced pressure. The residual aqueous suspension is rendered alkaline in the cold and extracted with 5 50 ml portions of chloroform. The combined organic extracts are washed twice with water, dried and filtered and the filtrate is evaporated. 3,4-Diamino-valerophenone is obtained in the form of brown crystals; melting point 106°-107°.

Workup

  1. temperatureis heated to the reflux temperature
  2. additionthe resulting solution is treated, in the course of 10 minutes
  3. temperatureunder reflux for a further 15 minutes
  4. customto react for a few minutes
  5. customthe organic solvent is then removed under reduced pressure
  6. extractionextracted with 5 50 ml portions of chloroform
  7. washThe combined organic extracts are washed twice with water
  8. customdried
  9. filtrationfiltered
  10. customthe filtrate is evaporated

Sources & evidence

ORD record
ord-7ef1847a242a4511933e0efde88cc389
Source dataset
uspto-grants-1982_08
Patent number
US04344957

Reaction notes

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