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210042-90-3

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210042-90-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 210042-90-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,0,0,4 and 2 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 210042-90:
(8*2)+(7*1)+(6*0)+(5*0)+(4*4)+(3*2)+(2*9)+(1*0)=63
63 % 10 = 3
So 210042-90-3 is a valid CAS Registry Number.

210042-90-3Relevant articles and documents

An efficient hetero Diels-Alder approach to imidazo[4,5-c]pyridazines as purine analogues

Deghati, Paymaneh Y.F.,Wanner, Martin J.,Koomen, Gerrit-Jan

, p. 4561 - 4564 (2007/10/03)

A general approach to 3-deaza-6-azapurine by a hetero Diels-Alder reaction is described. Reaction of sulfonamide protected 5-vinylimidazole with 4-phenyl-1,2,4-triazoline-3,5-dione in methanol gave the Diels-Alder adduct 8 in 85% yield. Deprotection of the resulting N-phenyltriazole was efficiently accomplished by ring opening with hydrazine followed by heating in DMSO. The completely deprotected and aromatized purine analogue 1 was obtained directly from this one-pot reaction in 48% yield.

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