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304884-75-1

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304884-75-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 304884-75-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,4,8,8 and 4 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 304884-75:
(8*3)+(7*0)+(6*4)+(5*8)+(4*8)+(3*4)+(2*7)+(1*5)=151
151 % 10 = 1
So 304884-75-1 is a valid CAS Registry Number.

304884-75-1Relevant articles and documents

1 - Aryl -2 - indolinone derivatives preparation method

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Paragraph 0019-0029, (2019/04/18)

The invention discloses a method for synthesis of 1-aryl-2-indolinone derivatives. The method comprises the following steps: dissolving N-aryl-substituted phenylacetamide (III) in an organic solvent, adding a chlorination reagent and carrying out a reaction so as to obtain N-chloro-N-aryl-substituted phenylacetamid (II); and subjecting N-chloro-N-aryl-substituted phenylacetamid to a reaction with a certain amount of Lewis acid and a proper amount of an organic solvent at a certain temperature so as to obtain 1-aryl-2-indolinone (I). The method provided by the invention has the advantages of simple operation, easily available reagents, a low price, mild conditions and capability of synthesizing a plurality of 1-aryl-2-indolinone (I) compounds.

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