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872692-21-2

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872692-21-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 872692-21-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,2,6,9 and 2 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 872692-21:
(8*8)+(7*7)+(6*2)+(5*6)+(4*9)+(3*2)+(2*2)+(1*1)=202
202 % 10 = 2
So 872692-21-2 is a valid CAS Registry Number.

872692-21-2Relevant articles and documents

Asymmetric michael reactions on polymeric support: Auxiliary immobilization and stereoselective construction of quaternary stereocenters

Kreidler, Burkard,Baro, Angelika,Christoffers, Jens

, p. 5339 - 5348 (2007/10/03)

Several strategies for the immobilization of a L-valine-derived auxiliary on a Merrifield resin and on poly(ethylene glycol) are reported. The latter is shown to work excellently in asymmetric copper(II)-catalyzed Michael reactions of cyclic β-oxo esters 2 with methyl vinyl ketone (4), yielding the corresponding addition products 5 with quaternary stereocenter in selectivities of 97-99 % ee. The PEG-supported auxiliary 1d can be precipitated from diethyl ether solutions and reused. A sulfur-containing β-oxo ester 2c was prepared in 92 % yield by a DMAP-catalyzed transesterification method in order to detect enamine formation on solid support. The sulfur content can be used as an additional parameter in combustion analysis and therefore, may act as a diagnostic probe for enamine formation. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.

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