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55249-71-3

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55249-71-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 55249-71-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,2,4 and 9 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 55249-71:
(7*5)+(6*5)+(5*2)+(4*4)+(3*9)+(2*7)+(1*1)=133
133 % 10 = 3
So 55249-71-3 is a valid CAS Registry Number.

55249-71-3Relevant articles and documents

Sulphur-oxygen versus carbon-oxygen bond fission in the solvolysis of benzyl sulphenates

Braverman,Reisman

, p. 3891 - 3896 (2007/10/05)

In contrast to p-anisyl trichloromethanesulphenate 1, which readily undergoes ethanolysis at room temperature with carbon-oxygen bond fission, the ethanolysis of the corresponding 2-nitrobenzenesulphenate 2 proceeds at a similar rate only at 100°, and involves sulphur-oxygen bond cleavage. While the solvolysis of 1 showed first-order kinetics, the solvolysis of 2 was second-order (first-order with respect to ester and to added base). The solvolysis rate of 2 decreases on going from 100% to 80% ethanol and by using pyridine instead of acetate as base, consistent with an SN2 type mechanism involving nucleophilic displacement at sulphur by the base or lyate ion. The rate of solvolysis of 1 is greatly enhanced in polar solvents and correlates satisfactorily with the ionization of p-methoxyneophyl tosylate. An ionization mechanism to some ion pair species is suggested for the solvolysis of 1.

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