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57857-68-8

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57857-68-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57857-68-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,8,5 and 7 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 57857-68:
(7*5)+(6*7)+(5*8)+(4*5)+(3*7)+(2*6)+(1*8)=178
178 % 10 = 8
So 57857-68-8 is a valid CAS Registry Number.

57857-68-8Relevant articles and documents

Diorganotellurium(IV) bis(fluorocarboxylates)

Srivastava, Sanjay Kumar,Srivastava, T. N.,Singh, Jai Deo,Srivastava, Arun K.,Kumar, P.

, p. 103 - 108 (2007/10/03)

Diorganotellurium(IV) bis(fluorocarboxylates) have been prepared by the interaction of R2Te(OMe)2 with fluorocarboxylic acids (R'COOH).Identical products were obtained by the metathetical reaction of R2TeCl2 with silver salts of the fluorocarboxylic acids in 1 : 2 molar ratios.However, when the reaction proceeded in a 1 : 1 molar ratio, the product was R2TeCl(OCOR').However, reaction of R2TeO with CF3COOH yielded 2*H2O> and species.The products are non-conducting and monomeric in solution.The mode of bonding of the fluorocarboxylate group and a possible geometry around the central tellurium atom are suggested on the basis of physicochemical and spectral (IR, mass, 1H, 13C, 19F and 125Te NMR) studies.

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