1-Tetralone → N-(3,4-dihydro-2H-naphthalen-1-ylidene)hydroxylamine

HRID 1725362Notes

Reaction equation

HRID 1725362 reaction equation
Cl.[NH2:2][OH:3].[CH2:4]1[CH2:14][C:12](=O)[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH2:5]1>CO>[C:12]1(=[N:2][OH:3])[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH2:5][CH2:4][CH2:14]1

Participants

4

Reactant 2

HCID 107241-TetraloneHCID 443297Hydroxyamine hydrochloride

Product 1

HCID 76876N-(3,4-dihydro-2H-naphthalen-1-ylidene)hydroxylamineYield 63.9%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Conditions

Temperature
22 °C

Procedure

Add hydroxylamine hydrochloride (71.0 g, 1.03 mol) to a solution of α-tetralone (100.0 g, 0.68 mol) in 300 mL of methanol and stir the resulting solution at reflux for 2 hours. Cool the mixture to 20-24° C. and concentrate under reduced pressure. Dilute the residue with 1 L of water and extract with dichloromethane. Wash the organic layer with saturated aqueous sodium chloride, dry over sodium sulfate, filter, and concentrate under reduced pressure. Crystallize the residue from isopropanol to provide the desired compound as an off-white solid (70.0 g, 63%).

Workup

  1. temperatureat reflux for 2 hours
  2. concentrationconcentrate under reduced pressure
  3. additionDilute the residue with 1 L of water
  4. extractionextract with dichloromethane
  5. washWash the organic layer with saturated aqueous sodium chloride
  6. dry with materialdry over sodium sulfate
  7. filtrationfilter
  8. concentrationconcentrate under reduced pressure
  9. customCrystallize the residue from isopropanol

Sources & evidence

ORD record
ord-7e05f2a32a9e4ca2b04a3ae1ffeae1c4
Source dataset
uspto-grants-2009_02
Patent number
US07491716B2

Reaction notes

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