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17722-76-8

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17722-76-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 17722-76-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,7,2 and 2 respectively; the second part has 2 digits, 7 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 17722-76:
(7*1)+(6*7)+(5*7)+(4*2)+(3*2)+(2*7)+(1*6)=118
118 % 10 = 8
So 17722-76-8 is a valid CAS Registry Number.

17722-76-8Relevant articles and documents

Synthesis method of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl

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Paragraph 0018; 0035; 0039-0040, (2021/06/13)

The invention discloses a synthesis method of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl. The method comprises the following steps: subjecting 2-chloro-5-aminobenzotrifluoride serving as a starting raw material and acyclic anhydride in a formula I to amidation to obtain an intermediate II, then carrying out reductive coupling reaction on the intermediate II to obtain an intermediate III, and finally carrying out deamidation reaction on the intermediate III to obtain the 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, wherein the cyclic anhydride in the formula I is succinic anhydride, glutaric anhydride, adipic anhydride or maleic anhydride. The starting material 2-chloro-5-aminobenzotrifluoride is an important farm chemical and medical intermediate, and is low in price, convenient and easy to obtain; the synthesis route is short, the reaction condition is mild, and the method is environment-friendly; the total yield of the synthetic route can reach 60-80%, and compared with the prior art, the synthetic route has obvious advantages and is suitable for industrial mass production.

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