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83023-81-8

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83023-81-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 83023-81-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,0,2 and 3 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 83023-81:
(7*8)+(6*3)+(5*0)+(4*2)+(3*3)+(2*8)+(1*1)=108
108 % 10 = 8
So 83023-81-8 is a valid CAS Registry Number.

83023-81-8Relevant articles and documents

Enantioselective, chromatography-free synthesis of β3-Amino acids with natural and unnatural side chains

Gerfaud, Thibaud,Chiang, Ying-Ling,Kreituss, Imants,Russak, Justin A.,Bode, Jeffrey W.

scheme or table, p. 687 - 696 (2012/07/13)

β3-Amino acids are key components of some pharmaceuticals, excellent surrogates for metabolically labile α-amino acids, and building blocks for chiral heterocycles. Unfortunately they are not easily accessible in enantiomerically pure form, especially when possessing unnatural side chains. A flexible, chromatography-free process for the synthesis of enantiopure β3-amino acids possessing natural and unnatural side chains is described. The procedure uses inexpensive starting materials and reagents and offers a good alternative to the hazardous and expensive Arndt-Eistert homologation of enantiopure α-amino acids. Its utility has been demonstrated with the preparative scale synthesis of two valuable β3-amino acids possessing unnatural side chains.

Synthesis and Diels-Alder reactions of 2-alkyl-5-methylene-1,3-dioxolan-4-ones and 2-alkyl-3-acyl-5-methylene-1,3-oxazolidin-4-ones: Highly exo and diastereoface selective chiral ketene equivalents

Roush,Essenfeld,Warmus,Brown

, p. 7305 - 7308 (2007/10/02)

Chiral dienophiles 1-3 undergo highly exo and diastereoface selective Diels-Alder reactions. The Diels-Alder reactions of 3 are also highly exo selective under Lewis acid catalyzed conditions.

Laboratory-Scale Enzymatic/Chemical Syntheses of D- and L-β-Chlorolactic Acid and D- and L-Potassium Glycidate

Hirschbein, Bernard L.,Whitesides, George M.

, p. 4458 - 4460 (2007/10/02)

This paper describes preparations of D- (and L-) chlorolactic acids having enantiomeric excesses greater than 97percent by D- (and L-) lactate dehydrogenase catalyzed reduction of chloropyruvic acid with NADH.In syntheses carried out on 0.1-0.5 mol scales

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