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72974-40-4

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72974-40-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 72974-40-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,9,7 and 4 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 72974-40:
(7*7)+(6*2)+(5*9)+(4*7)+(3*4)+(2*4)+(1*0)=154
154 % 10 = 4
So 72974-40-4 is a valid CAS Registry Number.

72974-40-4Downstream Products

72974-40-4Relevant articles and documents

Copper(II) Ethanoate-assisted Phosphonation of Aryl Halides

Connor, Joseph A.,Jones, Anthony C.,Price, Raymomd

, p. 137 - 138 (1980)

A mixed valence trinuclear copper complex 2> is formed in the reaction between a 2-halogenoaryl azo compound and a trialkyl phosphite in the presence of copper(II) ethanoate which gives the corresponding 2-(dialkylphosphonato)aryl azo compound.

Phosphonation of Aryl Halides by Copper(I) Complexes of Trialkyl Phosphites

Connor, Joseph A.,Dubowski, Danuta,Jones, Anthony,Price, Raymond

, p. 1143 - 1148 (2007/10/02)

The copper complexes 2> (1; R=Me or Et), (bpy)> (2; R=Me or Et) (bpy is 2,2'-bipyridine), and 2> react with certain 2-halogenoazobenzene compounds, ArX, at room temperature to form the corresponding dialkyl arylphosphonates, ArP(O)(OR)2, and the products, ArH and Ar2, of reductive substitution and biaryl coupling.The ester, MeCO2R, and a copper(I) halide complex (e.g. >) are also formed.Kinetic studies of the reactions of some of these copper complexes with 2'-acetamido-6-bromo-4'-diethylamino-2,4-dinitroazobenzene in alcohol solution show that the phosphonation reactions are equal concentration second-order processes in each case.The effects of a radical scavenger and of light on the reaction suggest the involvement of radicals in the formation of ArH and Ar2, but not in the formation of ArP(O)(OR)2.The effects of different substituents in ArX, of changes in solvent, and of various additives on these reactions are investigated.A mechanism involving concerted nucleophilic substitution within the coordination sphere of copper(I) is proposed.

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