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ChemicalBook CAS DataBase List Caronic anhydride
67911-21-1

Caronic anhydride synthesis

8synthesis methods
At present, the synthetic method of Caronic anhydride is mainly taking chrysanthemum monocarboxylate as raw material, after oxidation, saponification, acidifying and cyclodehydration, be prepared from.
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Yield:67911-21-1 91.97%

Reaction Conditions:

with acetic anhydride at 120 - 160; for 7 h;

Steps:

1-6

General procedure: Add 50mL of acetic anhydride to the above solution containing caronic acid, under 120 °C conditions, the insulation reflux reaction for 3h, continue to heat up to 160 °C, and insulate reflux reaction for 4h. Subsequently, caronic anhydride was distilled under reduced pressure to 18.46 g with a yield of 87.83%.

References:

CN114539046,2022,A Location in patent:Paragraph 0097; 0099; 0100-0106

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