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120757-17-7

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120757-17-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 120757-17-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,7,5 and 7 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 120757-17:
(8*1)+(7*2)+(6*0)+(5*7)+(4*5)+(3*7)+(2*1)+(1*7)=107
107 % 10 = 7
So 120757-17-7 is a valid CAS Registry Number.

120757-17-7Relevant articles and documents

Chemical synthesis method of Pimobendan

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Paragraph 0020; 0026; 0032; 0038; 0044, (2017/05/23)

The invention discloses a chemical synthesis method of Pimobendan. The method comprises steps as follows: acetanilide and 2-methyl-3-(chloroformyl)propionate react to produce 3-p-acetylaminobenzoyl methyl butyrate in a mixed organic solvent under the action of a composite catalyst, 3-p-acetylaminobenzoyl methyl butyrate reacts with a nitration reagent, 3-(4-acetamido-3-nitrobenzoyl)-methyl butyrate is produced and subjected to a reflux reaction with alkali in an alcohol solvent to produce 3-(4-amino-3-nitrobenzoyl) butyrate, 3-(4-amino-3-nitrobenzoyl) butyrate and hydrazine hydrate are subjected to a reflux reaction, 4,5-dihydro-5-methyl-6-(4-amino-3-nitrophenyl)-3(2H)-pyridazinone is produced and reduced with zinc powder in absolute methanol, 4,5-dihydro-5-methyl-6-(3,4-diaminophenyl)-3(2H)-pyridazinone is produced and subjected to a reflux reaction with p-anisaldehyde, and Pimobendan is obtained. The method comprises a few reaction steps, operation is safe and convenient, and the cost is low.

An Enantioselective Synthesis of SK and F 93505, a Key Intermediate for Preparing Cardiotonic Agents

Owings, Franklin F.,Fox, Margaret,Kowalski, Conrad J.,Baine, Neil H.

, p. 1963 - 1966 (2007/10/02)

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