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159189-61-4

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159189-61-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 159189-61-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,1,8 and 9 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 159189-61:
(8*1)+(7*5)+(6*9)+(5*1)+(4*8)+(3*9)+(2*6)+(1*1)=174
174 % 10 = 4
So 159189-61-4 is a valid CAS Registry Number.

159189-61-4Relevant articles and documents

Intramolecular ligation of carbonyl oxygen to central zinc in synthetic oligopeptide-linked zinc-porphyrins

Tamiaki,Kiyomori,Maruyama

, p. 2478 - 2486 (1994)

Oligopeptide-linked zinc-porphyrins were prepared (oligopeptide = -Phe(m)-Ala(n)-OMe and porphyrin = 5,15-diaryl-2,3,7,8,12,13,17,18-octaethylporphyrin). 1H NMR, IR, visible, and CD spectra of the synthetic molecule in a chlorinated methane (CDCl3 or CH2Cl2) showed that the carbonyl oxygen of the N-terminal amino acid of the linked peptide should ligate the central zine metal in the molecule as the axial ligand to form a pentacoordinated zinc-porphyrin. The coordination of the zinc with the peptide framework changed the optical and electrical properties, indicating that such ligation might control the reactivity in biological metallotetrapyrrole-protein systems as well as the coordination to the peptide residue.

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