2,3-Dimethylmaleic anhydride synthesis
- Product Name:2,3-Dimethylmaleic anhydride
- CAS Number:766-39-2
- Molecular formula:C6H6O3
- Molecular Weight:126.11
108-31-6
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Yield:-
Reaction Conditions:
Stage #1: maleic anhydride;acetic acidwith 2-aminopyridine at 100; for 0.5 h;
Stage #2: with sulfuric acid in water; for 3.2 h;Reflux;Temperature;Concentration;
Steps:
3.A A, Preparation of dimethyl maleic anhydride
maleic anhydride,2-aminopyridine and glacial acetic acid in accordance with the weight ratio of 1: 0.45: 2.5 mixed,Heated at a temperature of 100 under reflux conditions 0.5h,Then adding a concentration of 1.0mol / L sulfuric acid aqueous solution,Then heated to reflux 3.2h, cooled to room temperature,Followed by crystallization under stirring, filtered,Washed with water, dried at a temperature of 15 for 30min,Using NMR spectroscopy to determine the detection method,The product obtained by drying is colorless crystal dimethyl maleic anhydride;
References:
CN106748956,2017,A Location in patent:Paragraph 0073-0074; 0085-0086; 0097-0098; 0109-0110; 0121
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