Reaktion #461820

Reaktionsgleichung

9,10-dihydro-4,5-dihydroxy-9,10-dioxoanthracene-2-carboxylic acid

dimethyl sulphate

potassium carbonate

acetone

dioxan

→

Methyl 9,10-dihydro-4,5-dimethoxy-9,10-dioxoanthracene-2-carboxylate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas heated
2. 2
   Temperaturat reflux for 17 hours, with mechanical stirring
3. 3
   Temperaturto cool
4. 4
   Filtrationthe suspension was filtered
5. 5
   Waschenthe filter contents were washed with hot dioxan (5×50 ml)

Vorschrift

A mixture of 9,10-dihydro-4,5-dihydroxy-9,10-dioxoanthracene-2-carboxylic acid (28.4 g), dimethyl sulphate (59 ml; 79 g) and anhydrous potassium carbonate (207 g) in `Drierire` dried acetone (1350 ml) and dioxan (1200 ml) was heated at reflux for 17 hours, with mechanical stirring. After allowing to cool, the suspension was filtered and the filter contents were washed with hot dioxan (5×50 ml).

Quelle