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137653-62-4

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137653-62-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137653-62-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,6,5 and 3 respectively; the second part has 2 digits, 6 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 137653-62:
(8*1)+(7*3)+(6*7)+(5*6)+(4*5)+(3*3)+(2*6)+(1*2)=144
144 % 10 = 4
So 137653-62-4 is a valid CAS Registry Number.

137653-62-4Relevant articles and documents

The photocycloaddition reactions of uridine and related compounds with 2,3-dimethyl-2-butene

Ishikawa,Itoh,Takayanagi,Oshima,Kawahara,Mizuno,Ogura

, p. 1922 - 1930 (2007/10/02)

The photochemical reactions of uracil and 5-fluorouracil derivatives with simple alkenes have been investigated. Photocycloaddition of uracil or 5-fluorouracil derivatives and 2,3-dimethyl-2-butene in acetone gave an enantiomeric mixture of cross cycloadducts (4, 7) in moderate yields. Under similar conditions, diastereomers of 4-substituted 7,7,8,8-tetramethyl-cis-2,4-diazabicyclo[4.2.0]octane-3,5-dione nucleosides (14-17) were formed from uridine or 5-fluorouridine derivatives in good yields. The structures and stereochemistry of these cycloadducts of the nucleoside series were elucidated on the basis of the proton nuclear magnetic resonance spectra and X-ray crystallographic analysis.

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