Cas 81945-80-4,2,3a,5,7-Tetraphenyl-3,3a-dihydro-pyrazolo[1,5-c]pyrimidine

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Check Digit Verification of cas no

The CAS Registry Mumber 81945-80-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,9,4 and 5 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 81945-80:
(7*8)+(6*1)+(5*9)+(4*4)+(3*5)+(2*8)+(1*0)=154
154 % 10 = 4
So 81945-80-4 is a valid CAS Registry Number.

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81945-80-4Relevant academic research and scientific papers

PYRAZOLO(1,5-c)PYRIMIDINES FROM PYRYLIUM SALTS AND AMIDRAZONES AND PYRIDINE IMIDOYL-N-IMIDES FROM IMIDOYL CHLORIDES

Katritzky, Alan R.,Tomas, Alberto Tarraga

, p. 21 - 28 (2007/10/02)

2,4,6-Triphenylpyrylium salts react with unsubstituted amidrazones to give dihydropyrazolo(1,5-c)pyrimidines or salts of pyridine imidoyl-N-imides.Pyridine imidoyl-N-imides are conveniently prepared from N-aminopyridinium and imidoyl chlorides.

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