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216776-67-9

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216776-67-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 216776-67-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,6,7,7 and 6 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 216776-67:
(8*2)+(7*1)+(6*6)+(5*7)+(4*7)+(3*6)+(2*6)+(1*7)=159
159 % 10 = 9
So 216776-67-9 is a valid CAS Registry Number.

216776-67-9Relevant articles and documents

An easy direct conversion of pyridine- and pyrimidine-thiones into multi-fused heterocyclic compounds

Erian, Ayman Wahba,Abu-Shanab, Fathi Ali

, p. 2387 - 2391 (1998)

The reaction of azine-thiones with ethyl chlorofluoroacetate afforded 2- fluorothienoazines. The latter underwent self-condensation and gave multi- fused heterocyclic compounds. A wide range of unique heterocycles could be obtained on treatment of 2-fluorothienoazines with nitrogen nucleophilic reagents. The reactivity of the pyrimidine-thiones towards a variety of electrophilic reagents was studied. Chemical and spectroscopic evidence of the newly synthesized compounds are described.

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