Reaktion #215258

Reaktionsgleichung

1,4-dimethoxy-11,12-dihydroxy-9,10-ethano-anthracene

lead tetraacetate

→

1,4-Dimethoxy-9,10-anthracenedicarboxaldehyde

Lösungsmittel

acetic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISSOLUTIONis dissolved in 150 ml
2. 2
   Filtrationthe solution is filtered
3. 3
   Sonstigeto remove insoluble materials
4. 4
   Temperaturcooled
5. 5
   Sonstigeyielding orange crystals, which
6. 6
   Filtrationare filtered
7. 7
   Waschenwashed with glacial acetic acid
8. 8
   Sonstigedried

Vorschrift

A mixture of isomers of 1,4-dimethoxy-11,12-dihydroxy-9,10-ethano-anthracene weighing 10 g. is dissolved in 150 ml. of glacial acetic acid at 50° C. and treated portionwise with 30 g. of lead tetraacetate. After 2 hours at 50° C., the solution is filtered to remove insoluble materials and cooled yielding orange crystals, which are filtered, washed with glacial acetic acid and dried, m.p. 208°-212° C.

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