220557-90-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 220557-90-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,5,5 and 7 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 220557-90:
(8*2)+(7*2)+(6*0)+(5*5)+(4*5)+(3*7)+(2*9)+(1*0)=114
114 % 10 = 4
So 220557-90-4 is a valid CAS Registry Number.
220557-90-4Relevant academic research and scientific papers
Synthesis of β-substituted and α,β-disubstituted δ-carbolines using a halogen-dance reaction
Arzel, Erwan,Rocca, Patrick,Marsais, Francis,Godard, Alain,Quéguiner
, p. 215 - 226 (2007/10/03)
The paper describes the first total syntheses of β-substituted δ- carbolines and α,β-disubstituted δ-carbolines starting from benzene and pyridine blocks using a halogen-dance reaction.
