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1421947-25-2

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1421947-25-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1421947-25-2 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,2,1,9,4 and 7 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1421947-25:
(9*1)+(8*4)+(7*2)+(6*1)+(5*9)+(4*4)+(3*7)+(2*2)+(1*5)=152
152 % 10 = 2
So 1421947-25-2 is a valid CAS Registry Number.

1421947-25-2Relevant articles and documents

Exploring the scope of Bergman Cyclization mediated cascade reaction of alkenyl enediynes: Synthesis of [5]helicene and amino acid appended [4]helicenes

Roy, Snigdha,Basak, Amit

supporting information, p. 2184 - 2192 (2013/03/14)

Bergman Cyclization mediated cascade radical process is employed for the synthesis of [5]helicenes as well as diastereoselective mixtures of chiral amino acid appended [4]helicenes. Maximum selectivity (2.5:1) was found in case of l-leucine attached cyclic enediyne. Mechanistic considerations for this tandem radical reaction revealed that the major pathway probably involved quenching of the biradical, formed after aryl radical addition to pendant aromatic ring, by the solvent followed by aromatization. Intramolecular H-abstraction by the sp2-hybridized radical in the central ring or a 1,5-H shift followed by self-quenching could be the other possible ways to lead to the helicenes.

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