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25244-23-9

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25244-23-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25244-23-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,2,4 and 4 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 25244-23:
(7*2)+(6*5)+(5*2)+(4*4)+(3*4)+(2*2)+(1*3)=89
89 % 10 = 9
So 25244-23-9 is a valid CAS Registry Number.

25244-23-9Relevant articles and documents

Stereochemistry of Decarbalkoxylation of Cyclic Geminal Diesters Effected by Water and Lithium Chloride in Me2SO

Krapcho, A. Paul,Weimaster, John F.

, p. 4105 - 4111 (2007/10/02)

The stereochemical consequences of the decarbalkoxylation of cyclic geminal diesters by LiCl-H2O-Me2SO have been examined.The norbornene diester 13 and the norbornane diester 16 lead predominantly to the exoesters 14 and 17, respectively.The 2-methylcyclohexane diester 22 leads to esters containing more cis (23) than trans (24) isomer.The diesters 19,25, and 28 lead to nearly equal amounts of the cis and trans esters.In these latter cases,the enolates generated from the esters (via LDA) are protonated in a nonstereoselective fashion on quenching with water.This is suggestive of an enolate intermediate in the decarbalkoxylation reaction.The implications of these sterochemical results are discussed.

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