Sodium Hydroxide → Quinacridone

Participants

Reaction Conditions

Reaction Steps

79 Parts of methanol and 12 parts of a 50% NaOH aqueous solution were fully stirred in a stainless steel flask having a refluxing device. 10 Parts of the 6,13-dihydroquinacridone obtained in Example 1 and 10 parts of sodium m-nitrobenzenesulfonate were gradually mixed with the above-prepared solution, and the mixture was refluxed at 70° to 75° C. for 3 to 5 hours. The reaction mixture was cooled to 40° C. and filtered, and the resultant cake was cleaned with hot water until a wash liquid became colorless and transparent, to give 9.77 parts (98.3% of a theoretical value) of a nonsubstituted quinacridone. The so-obtained quinacridone was measured by IR and absorbance to show 99.2% of quinacridone and 0.8% of 6,13-dihydroquinacridone. The quinacridone had a specific surface area of 22.1 m2 /g.

Provenance & Evidence