9-hydroxy-1-oxo-1H-naphtho[2,1-b]pyran-2-carboxaldehyde acetate → 9-Hydroxy-1-oxo-1H-naphtho[2,1-b]pyran-2-carboxaldehyde

HRID 28238Notes

Reaction equation

HRID 28238 reaction equation
C(O)(=O)C.[OH:5][C:6]1[CH:19]=[C:18]2[C:9]([CH:10]=[CH:11][C:12]3[O:13][CH:14]=[C:15]([CH:21]=[O:22])[C:16](=[O:20])[C:17]=32)=[CH:8][CH:7]=1>C(O)=O>[OH:5][C:6]1[CH:19]=[C:18]2[C:9]([CH:10]=[CH:11][C:12]3[O:13][CH:14]=[C:15]([CH:21]=[O:22])[C:16](=[O:20])[C:17]=32)=[CH:8][CH:7]=1

Participants

3

Reactant 1

HCID 867372399-hydroxy-1-oxo-1H-naphtho[2,1-b]pyran-2-carboxaldehyde acetate

Product 1

HCID 130510419-Hydroxy-1-oxo-1H-naphtho[2,1-b]pyran-2-carboxaldehyde

Reagents, catalysts & solvents 1

HCID 284Formic AcidSolvent

Procedure

Prepared by refluxing 9-hydroxy-1-oxo-1H-naphtho[2,1-b]pyran-2-carboxaldehyde acetate (20.0 g, 0.071 m) in formic acid (250 ml, 88%) for 18 hrs. The product which crystallizes on cooling is filtered, washed with water, with acetone and sucked dry. The crystals are red-brown (16.0 g, 94%), m.p. dec>270° C.

Workup

  1. customPrepared
  2. customThe product which crystallizes
  3. temperatureon cooling
  4. filtrationis filtered
  5. washwashed with water, with acetone
  6. customsucked dry
  7. custom(16.0 g, 94%), m.p. dec>270° C.

Sources & evidence

ORD record
ord-b6acbcd6754a45438040d402baf6706d
Source dataset
uspto-grants-1980_09
Patent number
US04225722

Reaction notes

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