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778519-97-4

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778519-97-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 778519-97-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,7,8,5,1 and 9 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 778519-97:
(8*7)+(7*7)+(6*8)+(5*5)+(4*1)+(3*9)+(2*9)+(1*7)=234
234 % 10 = 4
So 778519-97-4 is a valid CAS Registry Number.

778519-97-4Downstream Products

778519-97-4Relevant articles and documents

Substituen Effect of Chelated Cobalt. 5. Acidities of (Carboxymethyl)- and (1-Carboxyethyl)cobaloximes. A Quantitative Analysis of the β Effect

Brown, Kenneth L.,Zahonyi-Budo, Eva

, p. 4117 - 4124 (2007/10/02)

pKa's of the weakly acidic (carboxymethyl)(ligand)cobaloximes and (1-carboxyethyl)(ligand)cobaloximes with 16 different axial ligands have been determined and correlated with those of 11 substituted acetic acids or 9 1-substituted propionic acids, respectively.Comparison of apparent ?1 values thus calculated with those previously determined by correlation of (carboxyethyl)(ligand)cobaloxime pKa's with the pKa's of 2-substituted propionic acid indicates that the (1-carboxyalkyl)cobalt comlexes show a substantial β effect as an apparent extreme donation density to the carboxyl carbon.The β effect in these complexes has been quantitated by use of a dual substituent parameter equation, the results of which show that the effect is only some 8-10percent enhanced in (1-carboxyethyl)cobaloximes relative to (carboxymethyl)cobaloximes.This result is consistent with the β effect being mediated by ?-? hyperconjugation rather than neighboring group participation.Structural effects on the extent of ?-? conjugation and the effects of ?-? conjugation on reactivity of the cobalt atom in these complexes are discussed.

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