117563-31-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 117563-31-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,5,6 and 3 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 117563-31:
(8*1)+(7*1)+(6*7)+(5*5)+(4*6)+(3*3)+(2*3)+(1*1)=122
122 % 10 = 2
So 117563-31-2 is a valid CAS Registry Number.
117563-31-2Relevant articles and documents
Conjugated Systems Derived from Piperazine-2,5-dione
Katritzky, Alan R.,Fan, Wei-Qiang,Szajda, Maria,Li, Qiao-Ling,Caster, Kenneth C.
, p. 591 - 597 (2007/10/02)
The preparation of mono- and of symmetrical and unsymmetrical bis-ylidene derivatives of piperazine-2,5-dione is described.The uv-visible absorption of the products is correlated with acceptor/donor character of the substituents.