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819793-73-2

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819793-73-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 819793-73-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,1,9,7,9 and 3 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 819793-73:
(8*8)+(7*1)+(6*9)+(5*7)+(4*9)+(3*3)+(2*7)+(1*3)=222
222 % 10 = 2
So 819793-73-2 is a valid CAS Registry Number.

819793-73-2Relevant articles and documents

Reactions of 1,4-benzodiazepinic N-nitrosoamidines with tosylmethyl isocyanide: A novel synthesis of midazolam

Del Pozo, Carlos,Macias, Alberto,Alonso, Eduardo,Gonzalez, Javier

, p. 2697 - 2703 (2007/10/03)

Reaction of 1,4-benzodiazepinic N-nitrosoamidines, used as synthetic equivalents of imidoyl chlorides, with the monoanion of tosylmethyl isocyanide is described. The process gives entry to 3-(4-tosyl)imidazo[1,5-a][1,4] benzodiazepines, compounds which have not been described yet in the literature. These systems can be derivatized to the corresponding trisubstituted 1,4-benzodiazepines by alkylation or acylation of the imidazole ring. These new heterocyclic derivatives are potentially useful in the field of medicinal chemistry. In addition, midazolam 3, the anesthetic properties of which are well established, can be easily prepared in one step by desulfonylation of compound 7a.

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