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203808-81-5

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203808-81-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 203808-81-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,8,0 and 8 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 203808-81:
(8*2)+(7*0)+(6*3)+(5*8)+(4*0)+(3*8)+(2*8)+(1*1)=115
115 % 10 = 5
So 203808-81-5 is a valid CAS Registry Number.

203808-81-5Relevant articles and documents

Nickel-catalyzed decarbonylative polymerization of 5-alkynylphthalimides: A new methodology for the preparation of polyheterocycles

Takeuchi, Makoto,Kurahashi, Takuya,Matsubara, Seijiro

, p. 1566 - 1568 (2013/01/15)

A nickel-catalyzed decarbonylative cycloaddition was developed, in which 5-alkynylphthalimides reacted to afford a new type of polyisoquinolone. It was demonstrated for the first time that decarbonylative cycloaddition can be an elementary process of polycondensation for the preparation of heterocyclic polymers.

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