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184178-55-0

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184178-55-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 184178-55-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,4,1,7 and 8 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 184178-55:
(8*1)+(7*8)+(6*4)+(5*1)+(4*7)+(3*8)+(2*5)+(1*5)=160
160 % 10 = 0
So 184178-55-0 is a valid CAS Registry Number.

184178-55-0Relevant articles and documents

Resolution of (±)-mandelic- and (±)-2-(chiorophenoxy)propionic-acid derivatives by crystallization of their diastereomeric amides with (R)- or (S)-α-arylethylamines

Jourdain, Franck,Hirokawa, Takahiko,Kogane, Tamizo

, p. 2509 - 2512 (2007/10/03)

An alternative and cost effective route for the resolution in high ees (95-99%) of (±)-mandelic-and (±)-2-(chlorophenoxy)propionic- acid derivatives is reported. The key step involves the covalent derivatization and separation of their diastereomeric amides with (R)- or (S)-α- arylethylamines.

Determination of the absolute configuration of amines and α-amino acids by 1H NMR of (R)-O-aryllactic acid amides

Chinchilla, Rafael,Falvello, Larry R.,Nájera, Carmen

, p. 7285 - 7290 (2007/10/03)

(R)-O-Aryllactic acid (ROAL) amides derived from α-chiral primary amines and α-amino acid esters show different chemical shifts in 1H NMR spectroscopy (300 MHz) depending on their configuration. Molecular mechanics, semiempirical calculations, and 1H NMR studies suggest that, in solution, these amides prefer an ap-Z conformation with the CαOAr and C=O groups close to anti-periplanar as in the case of mandelic acid amides. The proposed conformational preference is different from that of the ROAL esters (CαH and C=O groups in a syn-periplanar conformation). The conformational model for ROAL amides allows the absolute configuration assignment of primary amines and α-amino acid esters according to the relative position of the aryl group and the substituents on the amine moiety, and also their enantiomeric composition.

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