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263898-70-0

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263898-70-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 263898-70-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,3,8,9 and 8 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 263898-70:
(8*2)+(7*6)+(6*3)+(5*8)+(4*9)+(3*8)+(2*7)+(1*0)=190
190 % 10 = 0
So 263898-70-0 is a valid CAS Registry Number.

263898-70-0Relevant articles and documents

An efficient method to construct the A,B-rings component toward total syntheses of phycocyanobilin and its derivative as a photoprobe

Jayasundera, Krishanthi Padmarani,Kinoshita, Hideki,Inomata, Katsuhiko

, p. 497 - 500 (2007/10/03)

Total syntheses of physocyanobilin and its derivative bearing a photoreactive group at the D-ring accomplished by developing a new and efficient method for the construction of A,B-rings component, which consists of the Wittig-type new coupling reaction of 4-(1-methoxyethyl or 1- tosylethyl)-3-methyl-5-tosyl-1,5-dihydro-2H-pyrrol-2-one and a 2-formyl pyrrole derivative in the presence of (n)Bu3P and a base, followed by reduction with aluminum amalgam and a subsequent acid or base treatment.

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