81840-97-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81840-97-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,4 and 0 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 81840-97:
(7*8)+(6*1)+(5*8)+(4*4)+(3*0)+(2*9)+(1*7)=143
143 % 10 = 3
So 81840-97-3 is a valid CAS Registry Number.
81840-97-3Relevant articles and documents
Synthesis of 1,1-Diamino-2-acylethylenes - A Direct Acylation Route
Nair, M. D.,Rajappa, S.,Desai. J. A.
, p. 1 - 3 (2007/10/02)
The direct acylation of the active methyl groups in 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine and 1,2-dimethyl-4,5-dihydroimidazole with aroyl chloride yields diacyl derivatives which are hydrolysed to 1,1-diamino-2-acylethylenes.
