9-Amino-12-hydroxy-9,10-dihydro-9,10-ethanoanthracene → 9,10-Dihydro-9,10-methanoanthracene-9-carboxaldehyde

HRID 2198636Notes

Reaction equation

HRID 2198636 reaction equation
N[C:2]12[CH:17]([OH:18])[CH2:16][CH:9]([C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][C:15]=31)[C:8]1[C:3]2=[CH:4][CH:5]=[CH:6][CH:7]=1.N([O-])=O.[Na+]>C(O)(=O)C.O>[CH:17]([C:2]12[CH2:16][CH:9]([C:8]3[CH:3]=[CH:4][CH:5]=[CH:6][C:7]=31)[C:10]1[C:15]2=[CH:14][CH:13]=[CH:12][CH:11]=1)=[O:18]

Participants

5

Reactant 2

HCID 124041369-Amino-12-hydroxy-9,10-dihydro-9,10-ethanoanthraceneHCID 23668193Sodium Nitrite

Product 1

HCID 124041419,10-Dihydro-9,10-methanoanthracene-9-carboxaldehydeYield 100.5%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 962WaterSolvent2×

Procedure

To a solution of 9-amino-12-hydroxy-9,10-dihydro-9,10-ethanoanthracene (3.0 g) in acetic acid (240 ml) was added a solution of sodium nitrite (6.7 g) in water (120 ml) at 2°-5° C., and the resulting mixture was stirred at the same temperature for 1 hour and at 95°-105° C. for 5 hours. The reaction mixture was diluted with water and extracted with benzene. The benzene layer was washed with water, dried over sodium sulfate and evaporated to dryness to give crude crystals of 9-formyl-9,10-dihydro-9,10-methanoanthracene (2.8 g), which were recrystallized to give colorless crystals (2.45 g). M.P. 99°-100° C. Further, purification by recrystallization gave analytically pure 9-formyl-9,10-dihyfro-9,10-methanoanthracene, M.P. 102.5° C.

Workup

  1. extractionextracted with benzene
  2. washThe benzene layer was washed with water
  3. dry with materialdried over sodium sulfate
  4. customevaporated to dryness

Sources & evidence

ORD record
ord-0ab1124ef9204527ab5ea81e0a42c677
Source dataset
uspto-grants-1982_11
Patent number
US04358620

Reaction notes

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