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512163-89-2

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512163-89-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 512163-89-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,1,2,1,6 and 3 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 512163-89:
(8*5)+(7*1)+(6*2)+(5*1)+(4*6)+(3*3)+(2*8)+(1*9)=122
122 % 10 = 2
So 512163-89-2 is a valid CAS Registry Number.

512163-89-2Relevant articles and documents

Nonchelated d0 zirconium-alkoxide-alkene complexes

Stoebenau III, Edward J.,Jordan, Richard F.

, p. 8162 - 8175 (2007/10/03)

The reaction of Cp′2Zr(OtBu)Me (Cp′ = C5H4Me) and [Ph3C][B(C6F 5)4] yields the base-free complex [Cp′ 2Zr(OtBu)][B(C6F5)4] (6), which exists as Cp′2Zr(OtBu)(CIR)+ halocarbon adducts in CD2Cl2 or C6D 5Cl solution. Addition of alkenes to 6 in CD2Cl 2 solution at low temperature gives equilibrium mixtures of Cp′2- Zr(OtBu)(alkene)+ (12a-l), 6, and free alkene. The NMR data for 12a-l are consistent with unsymmetrical alkene bonding and polarization of the alkene C=C bond with positive charge buildup at Cint and negative charge buildup at Cterm. These features arise due to the lack of d-π* back-bonding. Equilibrium constants for alkene coordination to 6 in CD2Cl2 at -89 °C, K eq = [12][6]-1[alkene]-1, vary in the order: vinylferrocene (4800 M-1) ? ethylene (7.0) ≈ α-olefins > cis-2-butene (2.2) > trans-2-butene (a CD2Cl2 molecule, and rapid rotation of the alkene around the metal-(alkene centroid) axis.

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