642487-02-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642487-02-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,4,8 and 7 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 642487-02:
(8*6)+(7*4)+(6*2)+(5*4)+(4*8)+(3*7)+(2*0)+(1*2)=163
163 % 10 = 3
So 642487-02-3 is a valid CAS Registry Number.
642487-02-3Relevant articles and documents
Synthesis of a shape-persistent macrocycle with intraannular carboxylic acid groups
Fischer, Matthias,H?ger, Sigurd
, p. 9441 - 9446 (2007/10/03)
The synthesis of a shape-persistent macrocycle based on the phenylene-ethynylene backbone by the intermolecular oxidative Glaser-coupling of appropriate bisacetylenes is described. The ring contains two intraannular methyl carboxylates that were hydrolyze