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228422-44-4

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228422-44-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 228422-44-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,8,4,2 and 2 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 228422-44:
(8*2)+(7*2)+(6*8)+(5*4)+(4*2)+(3*2)+(2*4)+(1*4)=124
124 % 10 = 4
So 228422-44-4 is a valid CAS Registry Number.

228422-44-4Relevant articles and documents

Structure-driven design and synthesis of chiral dioxocyclam derivatives

Achmatowicz, Micha?,Szumna, Agnieszka,Zieliński, Tomasz,Jurczak, Janusz

, p. 9031 - 9041 (2007/10/03)

Based on an analysis of previously reported structures and a potential geometry fit with substrates, a new family of chiral dioxocyclam derivatives have been designed. The synthesis of those ligands was accomplished starting from l-proline and α-d-amino acids (converted to β-amino acids) with a key step of macrocyclization reaction of amino esters. All ligands were converted into neutral copper(II) complexes (amide groups underwent deprotonation of upon treatment of ligands with copper(II) acetate). The complexes exhibit the desired shape of their active surfaces, as proved by X-ray analysis.

Precursors for the production of chiral 1,3-aminoalcohols

-

, (2008/06/13)

The disclosure describes novel precursors for the preparation of chiral 1,3-aminoalcohols. The precursors are chiral 4-hydroxycarboxamides, 4-hydroxyhydroxamic acids, or 4-hydroxyhydrazides produced from chiral gamma-lactones, which in turn are derived from 1,4-diols by stereoselective oxidation. The chiral 4-hydroxycarboxamides, 4-hydroxyhydroxamic acids, or 4-hydroxyhydrazides are converted into chiral 1,3-aminoalcohols by stereospecific rearrangement.

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