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3573-76-0

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3573-76-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 3573-76-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,5,7 and 3 respectively; the second part has 2 digits, 7 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 3573-76:
(6*3)+(5*5)+(4*7)+(3*3)+(2*7)+(1*6)=100
100 % 10 = 0
So 3573-76-0 is a valid CAS Registry Number.

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.

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