74167-55-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 74167-55-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,1,6 and 7 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 74167-55:
(7*7)+(6*4)+(5*1)+(4*6)+(3*7)+(2*5)+(1*5)=138
138 % 10 = 8
So 74167-55-8 is a valid CAS Registry Number.
74167-55-8Relevant articles and documents
N-Alkylations of Unsymmetric Piperazines
Chung, Byung-Ho,Zymalkowski, Felix
, p. 323 - 329 (1984)
Unsymmetrically 1,4-disubstituted piperazines can be N-(or N'-)mono- or N,N'-bisalkylated.If the two substituents differ in size sufficiently, monoalkylations occur regiospecifically.