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642487-02-3

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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

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