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181772-92-9

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181772-92-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181772-92-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,7,7 and 2 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 181772-92:
(8*1)+(7*8)+(6*1)+(5*7)+(4*7)+(3*2)+(2*9)+(1*2)=159
159 % 10 = 9
So 181772-92-9 is a valid CAS Registry Number.

181772-92-9Relevant articles and documents

Asymmetric syntheses of (+)-negamycin, (+)-3-epi-negamycin and sperabillin C via lithium amide conjugate addition

Davies, Stephen G.,Ichihara, Osamu,Roberts, Paul M.,Thomson, James E.

, p. 216 - 227 (2011/03/17)

The chemo- and enantioselective reduction of ethyl 4-chloroacetoacetate and the diastereoselective conjugate addition of enantiopure lithium N-benzyl-N-(α-methylbenzyl)amide to an α,β-unsaturated ester have been used as the key steps in the total asymmetric syntheses of (+)-negamycin (in 13 steps and 24% overall yield), (+)-3-epi-negamycin (in 13 steps and 10% overall yield) and sperabillin C (in 17 steps and 13% overall yield) from commercially available starting materials.

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