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104113-23-7

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104113-23-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 104113-23-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,4,1,1 and 3 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 104113-23:
(8*1)+(7*0)+(6*4)+(5*1)+(4*1)+(3*3)+(2*2)+(1*3)=57
57 % 10 = 7
So 104113-23-7 is a valid CAS Registry Number.

104113-23-7Relevant articles and documents

Synthesis of Condensed Tannins. Part 14. Biflavanoid Profisetinidins as Synthons. The Acid-Induced 'Phlobaphene'Reaction

Young, Desmond A.,Cronje, Annemarie,Botes, Adrienne L.,Ferreira, Daneel,Roux, David G.

, p. 2521 - 2528 (2007/10/02)

Free phenolic - and -2,3-trans-(-)-fisetinidol-(+)-catechin diastereoisomers of both 3,4-trans and 3,4-cis configuration, which serve as synthons for higher oligomers, are available in improved yields from direct condensation, and also via novel 6-iodo-(+)-catechin as an intermediate substrate.Acid-induced transformations of the predominant -all-trans isomer, illustrative of the well-known 'phlobaphene reaction' of condensed tannins, is shown to include ring-isomerization and fission of the inter-flavanoid bond, followed in the latter instance by the alternatives of anthocyanidin formation, positional rearrangement and self-condensation.

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