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81559-84-4

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81559-84-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81559-84-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,5,5 and 9 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 81559-84:
(7*8)+(6*1)+(5*5)+(4*5)+(3*9)+(2*8)+(1*4)=154
154 % 10 = 4
So 81559-84-4 is a valid CAS Registry Number.

81559-84-4Relevant articles and documents

Addition Reactions of Azoesters with 2-Thioquinazolinones

Giannola, Libero Italo,Giammona, Gaetano,Carlisi, Bianca,Palazzo, Salvatore

, p. 1557 - 1560 (2007/10/02)

Reaction between diethyl azodicarboxylate (I) and 1,2,3,4-tetrahydro-2-thioquinazolin-4-one (II), as a cyclic model of thiourea, both in alcoholic medium and in inert solvents has been investigated.By carrying out the reaction in an inert solvent, it was possible to isolate an intermediate.Evidence is presented that the intermediate, in turn, was converted into the final products.Structures were unequivocally assigned by mass spectrometry.

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