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344749-21-9

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344749-21-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 344749-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,4,7,4 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 344749-21:
(8*3)+(7*4)+(6*4)+(5*7)+(4*4)+(3*9)+(2*2)+(1*1)=159
159 % 10 = 9
So 344749-21-9 is a valid CAS Registry Number.

344749-21-9Relevant articles and documents

Synthesis and Spectra of Two Novel Catenanes

Logemann, Enno,Rissler, Klaus,Schill, Gottfried,Fritz, Hans

, p. 2245 - 2260 (2007/10/02)

In multi-step reaction sequences the precatenanes 23b, c are synthesised.After breaking the chemical bonds between the aromatic nuclei and the bridge head atoms of the double bridged system the -catenanes 25 b, c are obtained.The 13C NMR and mass spectra of the precatenanes and catenanes are discussed.

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