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442858-40-4

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442858-40-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 442858-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,2,8,5 and 8 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 442858-40:
(8*4)+(7*4)+(6*2)+(5*8)+(4*5)+(3*8)+(2*4)+(1*0)=164
164 % 10 = 4
So 442858-40-4 is a valid CAS Registry Number.

442858-40-4Relevant articles and documents

New bis(imino)pyridine-iron(II)- and cobalt(II)-based catalysts: Synthesis, characterization and activity towards polymerization of ethylene

Abu-Surrah, Adnan S,Lappalainen, Kristian,Piironen, Ulla,Lehmus, Petri,Repo, Timo,Leskel?, Markku

, p. 55 - 61 (2002)

The synthesis of a new series of iron(II)- and cobalt(II)-based complexes of the general formula M(NONON) Cl2 (M = Fe; M = Co) bearing 2,6-bis(imin)pyridyl ligands [A-N=C-Py-C=N-A] that carry bulky, alkyl-free aromatic terminals (A = naphthyl, pyrenyl, 2-benzylphenyl, phenyl) or chiral cycloaliphatic auxiliary moieties (A = ((-)-cis-myrtanyl) is described. The Fe(II) complexes are exceptionally active (up to 40800 kg PE/(mol M h) towards the polymerization of ethylene in the presence of methylaluminoxane (MAO) as activator. Varying the steric bulkiness of the aromatic groups in the tridentate ligands affects catalytic productivity, molecular weight and for the first time the microstructure of the resulted material. The Fe(II) precatalysts are an order of magnitude more active than the corresponding Co(II) precatalysts.

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