157722-34-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157722-34-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,2 and 2 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 157722-34:
(8*1)+(7*5)+(6*7)+(5*7)+(4*2)+(3*2)+(2*3)+(1*4)=144
144 % 10 = 4
So 157722-34-4 is a valid CAS Registry Number.
157722-34-4Relevant academic research and scientific papers
Cyclobutarenes. Part 4. Biphenylenobiphenylene
Shepherd, Michael K.
, p. 1055 - 1060 (2007/10/02)
Flash vacuum thermolysis of phenanthrolinophenanthroline 6 gave biphenylenobiphenylene 2.The properties of this system are compared with those of the previously reported biphenylenobiphenylenes 3 and 4, and are in accord with expectations from simple resonance theory.
