219540-56-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 219540-56-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,9,5,4 and 0 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 219540-56:
(8*2)+(7*1)+(6*9)+(5*5)+(4*4)+(3*0)+(2*5)+(1*6)=134
134 % 10 = 4
So 219540-56-4 is a valid CAS Registry Number.
219540-56-4Relevant articles and documents
Poly-orthophenylenes: Synthesis by Suzuki coupling and solid state helical structures
Blake, Alexander J.,Cooke, Paul A.,Doyle, Kevin J.,Gair, Susan,Simpkins, Nigel S.
, p. 9093 - 9096 (2007/10/03)
The preparation of ortho-polyphenylene oligomers, having 3-9 rings, using a rational Suzuki coupling stretegy, has been achieved, and a helical structure determined for a number of these products by X-ray crystallography.
