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171511-22-1

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171511-22-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 171511-22-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,1,5,1 and 1 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 171511-22:
(8*1)+(7*7)+(6*1)+(5*5)+(4*1)+(3*1)+(2*2)+(1*2)=101
101 % 10 = 1
So 171511-22-1 is a valid CAS Registry Number.

171511-22-1Relevant articles and documents

A Facile Synthesis of 5H-1-Thia-3,5,6,8-tetraazaacenaphthylenes

Tumkevicius, Sigitas

, p. 1703 - 1706 (2007/10/02)

Ethyl 5-substituted 7-(methylthio)-5H-1-thia-3,5,6,8-tetraazaacenaphthylene-2-carboxylates (5a-f) representing a new heterocyclic system were prepared by acid-catalyzed cyclocondensation of ethyl 5-amino-4-(substituted amino)-2-(methylthio)thienopyrimidine-6-carboxylates (3a-f) with triethyl orthoformate.Compounds 3 were obtained by aminolysis of 4,6-dichloro-2-(methylthio)pyrimidine-5-carbonitrile (1) affording 2 followed by base-promoted cyclization with sodium ethyl thioglycolate. - Keywords: Thienopyrimidines, 4,5-diamino- / Triethyl orthoformate / Cyclocondensation / 5H-1-Thia-3,5,6,8-tetraazaacenaphthylenes

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