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21002-18-6

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21002-18-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21002-18-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,0 and 2 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21002-18:
(7*2)+(6*1)+(5*0)+(4*0)+(3*2)+(2*1)+(1*8)=36
36 % 10 = 6
So 21002-18-6 is a valid CAS Registry Number.

21002-18-6Relevant articles and documents

Copper-catalyzed domino reaction of carbodiimides and benzoic acid derivatives for the synthesis of quinazolinediones

Duangjan, Chanikan,Rukachaisirikul, Vatcharin,Saithong, Saowanit,Kaeobamrung, Juthanat

, p. 3537 - 3540 (2018)

Quinazolinediones were obtained from 2-iodobenzoic acids and carbodiimide derivatives under mild reaction conditions via a copper-catalyzed domino reaction. The absence of an external base was essential to avoid the generation of amide by-products. Both alkyl- and aryl-substituted carbodiimides gave the corresponding quinazolinediones. However, the use of aryl-substituted carbodiimides resulted in low yields due to an undesired elimination process.

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