137840-48-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 137840-48-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,8,4 and 0 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 137840-48:
(8*1)+(7*3)+(6*7)+(5*8)+(4*4)+(3*0)+(2*4)+(1*8)=143
143 % 10 = 3
So 137840-48-3 is a valid CAS Registry Number.
137840-48-3Relevant academic research and scientific papers
Reactions of 1-aza-pentadienyl anions with michael acceptors: Regiochemistry
Baumann, Florian,Wuerthwein, Ernst-Ulrich
, p. 4683 - 4686 (2007/10/02)
The addition of Michael acceptors 3-6 to 1-aza-pentadienyl metal compounds 1, 2 provides access to two main regioisomers (Type A and B, B′); the relative yields may effectively be influenced by the choice of the metal ion of 1, 2.
