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19835-72-4

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19835-72-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19835-72-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,3 and 5 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 19835-72:
(7*1)+(6*9)+(5*8)+(4*3)+(3*5)+(2*7)+(1*2)=144
144 % 10 = 4
So 19835-72-4 is a valid CAS Registry Number.

19835-72-4Relevant articles and documents

Stereochemical studies. XI. Equilibria between δ-hydroxy-acids and δ-lactones in aqueous tetrahydrofuran. Relative stabilities of isomeric δ-lactones

Edward, John T.,Cooke, Ellen,Paradellis, Themistocles C.

, p. 2546 - 2553 (2007/10/02)

The equilibrium constants K' for the hydrolysis of 13 δ-lactones to hydroxy-acids in 54percent (mol/mol) aqueous tetrahydrofuran at 25 deg C have been determined.The equilibrium constants for the isomerization of the five δ-lactones into their epimers, and for the isomerization of their hydroxy-acids into their epimers, have been calculated by the methods of conformational analysis.These calculated values are consistent with the experimental values of K'.Addition of methyl groups to a hydroxy-acid decreases K' (the Thorpe-Ingold effect).

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