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256389-53-4

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256389-53-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 256389-53-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,6,3,8 and 9 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 256389-53:
(8*2)+(7*5)+(6*6)+(5*3)+(4*8)+(3*9)+(2*5)+(1*3)=174
174 % 10 = 4
So 256389-53-4 is a valid CAS Registry Number.

256389-53-4Relevant articles and documents

Catalytic asymmetric insertion of diazoesters into Aryl-CHO bonds: Highly enantioselective construction of chiral all-carbon quaternary centers

Gao, Lizhu,Kang, Byung Chul,Ryu, Do Hyun

, p. 14556 - 14559 (2013)

This paper describes a catalytic enantioselective route to synthesize functionalized all-carbon quaternary acyclic systems via a boron Lewis acid-promoted formal C-C insertion of diazoesters into aryl-CHO bonds. In the presence of chiral (S)-oxazaborolidinium cation 1d as a catalyst, the reaction proceeded in good yield (up to 83%) with good regioselectivity (up to 88:12) and excellent enantioselectivity (up to 99% ee). The synthetic potential of this method was illustrated by conversion of the products to both α-and β-amino esters.

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