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172256-32-5

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172256-32-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172256-32-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,2,5 and 6 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 172256-32:
(8*1)+(7*7)+(6*2)+(5*2)+(4*5)+(3*6)+(2*3)+(1*2)=125
125 % 10 = 5
So 172256-32-5 is a valid CAS Registry Number.

172256-32-5Relevant articles and documents

A New Route to the Improved Synthesis of 1-(Alkoxymethyl)-5-alkyl- 6-(arylselenenyl)uracils

Lee, Namkyu,Kim, Young-Woo,Kim, Key H.,Kim, Dae-Kee

, p. 659 - 663 (1997)

A new route to C-6-selenenyl analogs of compound 1a from 5-alkyl-6-chlorouracils 6a-b has been described. A mild and highly efficient synthesis of 1-(alkoxymethyl)-5-alkyl-6-(arylselenenyl)uracils 8a-e has been accomplished from 6a-b in good yields using a two step procedure. Silylation of 5-alkyl-6-chlorouracils 6a-b using N,O-bis(trimethylsilyl)acetamide followed by regioselective alkylation of the silylated intermediate with ethyl or benzyl chloromethyl ether in dichloromethane afforded the desired 1-(alkoxymethyl)-5-alkyl-6-chlorouracils 7a-d in 88-94% yields. Compounds 7a-d readily underwent addition-elimination reaction with an appropriate arylselenol in the presence of ethanolic sodium hyroxide to produce the corresponding 1-(alkoxymethyl)-5-alkyl-6-(arylselenenyl)uracils 8a-e in excellent yields (94-99%).

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