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19557-02-9

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19557-02-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19557-02-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,5,5 and 7 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 19557-02:
(7*1)+(6*9)+(5*5)+(4*5)+(3*7)+(2*0)+(1*2)=129
129 % 10 = 9
So 19557-02-9 is a valid CAS Registry Number.

19557-02-9Downstream Products

19557-02-9Relevant articles and documents

Pyrolysis of the Tosylhydrazone Sodium Salts of Two Bicyclic Lactones

Ayral-Kaloustian, Semiramis,Agosta, William C.

, p. 284 - 287 (2007/10/02)

Lactone tosylhydrazone sodium salt 17a was prepared from lactone 10 by way of thionolactone 14.The tert-butyl homologue 17b was available by way of hydroxy nitrile 5.Pyrolysis of these salts led to enol ethers 18a,b and the ring-contracted ketones 19a,b.Together with earlier work, our results suggest that biradical 3 is probably an intermediate in conversion of alkoxycarbene 2 to ketone 4 and that the activation energy for this biradical coupling is ca. 2-3 kcal/mol.

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