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720700-86-7

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720700-86-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 720700-86-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,2,0,7,0 and 0 respectively; the second part has 2 digits, 8 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 720700-86:
(8*7)+(7*2)+(6*0)+(5*7)+(4*0)+(3*0)+(2*8)+(1*6)=127
127 % 10 = 7
So 720700-86-7 is a valid CAS Registry Number.

720700-86-7Downstream Products

720700-86-7Relevant articles and documents

Cationic nickel complexes containing bulky phosphine ligands: Catalyst precursors for styrene polymerization

Jimenez-Tenorio, Manuel,Puerta, M. Carmen,Salcedo, Isabel,Valerga, Pedro,Costa, Sandra I.,Silva, Leonel C.,Gomes, Pedro T.

, p. 3139 - 3146 (2008/10/09)

The cationic complexes [Ni(η3-CH2C(R)CH 2)(P)2] IBPh4] (R = Me, H; (P)2 = (PMei-Pr2)2, (PPhiPr 2)2, 1,2-bis(diisopropylphosphino)ethane (dippe)) and [Ni(η-2-MeInd)(P)2] [BPh4] (2-Melnd = 2-methylindenyl; (P)2 = (PMeiPr2)2, (PPh iPr2)2, dippe) have been prepared and characterized. These materials are catalyst precursors for the nonliving polymerization of styrene to polystyrene without the need of a cocatalyst such as methylaluminoxane. The polymerization reactions are carried out in refluxing 1,2-dichloroethane, using a 1:1000 catalyst to styrene ratio, yielding essentially atactic polystyrenes with Mn in the range 14 500-155 000 Da and polydispersities between 1.89 and 9.70. The mass properties of the polymers and the overall yield depend much on the nature of the catalyst precursor.

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