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19721-16-5

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19721-16-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19721-16-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,7,2 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 19721-16:
(7*1)+(6*9)+(5*7)+(4*2)+(3*1)+(2*1)+(1*6)=115
115 % 10 = 5
So 19721-16-5 is a valid CAS Registry Number.

19721-16-5Relevant academic research and scientific papers

Fast Synthesis of Amino Acid Salts and Lactams without Solvent under Microwave Irradiation

Laurent, Alain,Jacquault, Patrick,Martino, Jean-Louis Di,Hamelin, Jack

, p. 1101 - 1102 (1995)

Hydroxylamine-O-sulfonic acid reacts with alicyclic ketones over SiO2 under microwave irradiation to give an amino acid salt, which cyclises in high yield to the corresponding lactam after work up in basic medium.

REACTION OF KETONES WITH HYDROXYLAMINE-O-SULFONIC ACID

Novoselov, E. F.,Isaev, S. D.,Yurchenko, A. G.,Vodichka, L.,Trshiska, Ya.

, p. 2284 - 2289 (2007/10/02)

Alicyclic ketones react with an aqueous solution of hydroxylamine-O-sulfonic acid, forming the products from a Beckmann rearrangement.The intermediate products (o-sulfoketoximes) were isolated in the form of ammonium salts, and it was shown that they are capable of undergoing thermal rearrangement to amides.

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