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131365-80-5

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131365-80-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131365-80-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,3,6 and 5 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 131365-80:
(8*1)+(7*3)+(6*1)+(5*3)+(4*6)+(3*5)+(2*8)+(1*0)=105
105 % 10 = 5
So 131365-80-5 is a valid CAS Registry Number.

131365-80-5Relevant articles and documents

Rearrangement of 3,3-Disubstituted 1-Aryl-4,5-dihydro-5-oxo-3H-1,2,4-triazolium Tetrafluoroborates; Part 2. A Convenient Synthesis of 1,5-Annulated 1,2-Dihydro-2-phenyl-3H-1,2,4-triazol-3-ones

Gstach, Hubert,Seil, Patrick

, p. 808 - 815 (2007/10/02)

1-Isocyanato-1-(phenylazo)cycloalkanes 3 react with tetrafluoroboric acid to yield 3-spiro substituted 4,5-dihydro-5-oxo-1-phenyl-3H-1,2,4-triazolium tetrafluoroborates 4.Compounds 4 rearrange with ring expansion in good yield to give, after basic workup,

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