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131968-97-3

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131968-97-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131968-97-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,9,6 and 8 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 131968-97:
(8*1)+(7*3)+(6*1)+(5*9)+(4*6)+(3*8)+(2*9)+(1*7)=153
153 % 10 = 3
So 131968-97-3 is a valid CAS Registry Number.

131968-97-3Relevant articles and documents

A New Route to the Synthesis of Amino Acids through the Mercury Cyclization of Chiral Amidals

Amoroso, Rosa,Cardillo, Giuliana,Tomasini, Claudia,Tortoreto, Paola

, p. 1082 - 1087 (2007/10/02)

By means of the mercury cyclization of the unsaturated amidals 3a-e, obtained from the reaction of 1,3,5-tris-hexahydrotriazine (1) and α,β-unsaturated acyl chlorides, diastereomeric mixtures of imidazolidin-4-ones 5-8 and perihydropyrimidin-4-ones 9-10 have been synthesized and easily separated by flash chromatography.The subsequent hydrolysis under acid conditions of the separated heterocycles affords respectively D or L α- and β-amino acids.The regiochemistry of the cyclization has been studied, depending on the substituents of the double bond.Furthermore the absolute configuration of the newly introduced stereogenic center has been attributed on the basis of the 1H NMR spectra of the heterocycles.

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