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683247-05-4

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683247-05-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 683247-05-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,3,2,4 and 7 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 683247-05:
(8*6)+(7*8)+(6*3)+(5*2)+(4*4)+(3*7)+(2*0)+(1*5)=174
174 % 10 = 4
So 683247-05-4 is a valid CAS Registry Number.

683247-05-4Relevant articles and documents

Asymmetric aza-[2,3]-Wittig sigmatropic rearrangements: Chiral auxiliary control and formal asymmetric synthesis of (2S, 3R, 4R)-4-hydroxy-3- methylproline and (-)-kainic acid

Anderson, James C.,O'Loughlin, Julian M. A.,Tornos, James A.

, p. 2741 - 2749 (2007/10/03)

A survey of 16 different chiral auxiliaries and a variety of strategies found that an (-)-8-phenylmenthol ester of a glycine derived migrating group can control the absolute stereochemistry of aza-[2,3]-Wittig sigmatropic rearrangements with diastereoselectivities of ca. 3 : 1 with respect to the auxiliary. In two specific examples, ca. 50% yields of enantiomerically pure products were obtained after chromatographic purification. These were synthetically manipulated with no erosion of stereochemistry into intermediates that completed formal asymmetric syntheses of (+)-HyMePro and (-)-kainic acid. The Royal Society of Chemisrry 2005.

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