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144028-26-2

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144028-26-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 144028-26-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,0,2 and 8 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 144028-26:
(8*1)+(7*4)+(6*4)+(5*0)+(4*2)+(3*8)+(2*2)+(1*6)=102
102 % 10 = 2
So 144028-26-2 is a valid CAS Registry Number.

144028-26-2Downstream Products

144028-26-2Relevant articles and documents

Hemilabile Ligands in Organolithium Chemistry: Substituent Effects on Lithium Ion Chelation

Ramirez, Antonio,Lobkovsky, Emil,Collum, David B.

, p. 15376 - 15387 (2007/10/03)

The lithium diisopropylamide-mediated 1,2-elimination of 1-bromocyclooctene to provide cyclooctyne is investigated using approximately 50 potentially hemilabile polyethers and amino ethers. Rate laws for selected ligands reveal chelated monomer-based pathways. The dependence of the rates on ligand structure shows that anticipated rate accelerations based on the gem-dimethyl effect are nonexistent and that substituents generally retard the reaction. With the aid of semiempirical and DFT computational studies, the factors influencing chelation are discussed. It seems that severe buttressing within chelates of the substitutionally rich ligands precludes a net stabilization of the chelates relative to nonchelated (η 1-solvated) forms. One ligand-MeOCH2CH2NMe 2-appears to promote elimination uniquely by a higher-coordinate monomer-based pathway.

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