天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List 2,3-Dimethylmaleic anhydride
766-39-2

2,3-Dimethylmaleic anhydride synthesis

8synthesis methods
-

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

2,3-Dimethylmaleic anhydride Related Search: