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16691-49-9

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16691-49-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 16691-49-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,6,9 and 1 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 16691-49:
(7*1)+(6*6)+(5*6)+(4*9)+(3*1)+(2*4)+(1*9)=129
129 % 10 = 9
So 16691-49-9 is a valid CAS Registry Number.

16691-49-9Relevant academic research and scientific papers

A one-pot, three-component, microwave-promoted synthesis of 2-amino-substituted 7-amino-1,2,4-triazolo[1,5-a][1,3,5]triazines

Kalinina, Svetlana A.,Kalinin, Dmitrii V.,Dolzhenko, Anton V.

, p. 5537 - 5540 (2013/09/23)

A new, efficient, catalyst-free, one-pot, three-component method for the synthesis of 2-amino-substituted 7-amino-1,2,4-triazolo[1,5-a][1,3,5]triazines using 3,5-diamino-1,2,4-triazoles, cyanamide, and triethyl orthoformate is developed. The reaction proceeds smoothly under microwave-assisted heating. Advantages of the method include using easily available reagents, short reaction times, and operational simplicity.

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