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139228-29-8

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139228-29-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139228-29-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,2,2 and 8 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 139228-29:
(8*1)+(7*3)+(6*9)+(5*2)+(4*2)+(3*8)+(2*2)+(1*9)=138
138 % 10 = 8
So 139228-29-8 is a valid CAS Registry Number.

139228-29-8Relevant articles and documents

Use of methyl 2-iodo-2-(phenylsulfonyl)-4-pentenoate in atom-transfer radical cyclizations. Entry into annulation products containing carbonyl or exo-methylene functionality

Flynn,Zabrowski,Nosal

, p. 7281 - 7282 (2007/10/02)

Methyl 2-iodo-2-(phenylsulfonyl)-4-pentenoate (8) is reacted with N-BOC-allylamine to afford substituted 3-azabicyclo-[3.3.0]octanes (10) in a process which involves an initial iodine atom-transfer annulation followed by an ionic cyclization. The geminal carbomethoxy and phenylsulfonyl groups are then efficiently converted to either an exocyclic olefin or to a carbonyl group. The latter transformation allows phenylsulfonylacetates to be used as surrogates for acyl radicals in synthesis.

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