3573-76-0Relevant articles and documents
Preparation method of bicyclo-tetracarboxylic dianhydride
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Paragraph 0010; 0020-0029; 0030-0039; 0040-0049, (2018/06/04)
The invention discloses a preparation method of bicyclo-tetracarboxylic dianhydride, and belongs to the field of a preparation method of fine chemicals. In the technical scheme, the preparation methodis mainly characterized in that with cheap phthalic acid being initial raw materials, 3,5-cyclopentadiene-1,2-dicarboxylic acid is generated through electrolytic reduction; then the 3,5- cyclopentadiene-1,2-dicarboxylic acid reacts with maleic anhydride, acetic anhydride or propionic anhydride is used as solvent and a dehydrating agent, and bicyclo-tetracarboxylic dianhydride is generated under 1,4-addition reaction and dehydrating ring-closure reaction. In the scheme, the preparation method has the advantages of being low in manufacturing cost, high in utilization rate of atoms, high in yield, mild in reaction condition, environmentally friendly and the like.
N-cyanoimides
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, (2008/06/13)
Polyfunctional N-cyanoimides and their precursors and derivatives are disclosed along with methods for their preparation and interconversion. Also disclosed are curable compositions comprising the N-cyanoimides or poly(amide-cyanoamides) and reactive diluents as well as novel dianhydrides, polyimides, and poly(amide-cyanoamides) and methods for making them.