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1533-44-4

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1533-44-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1533-44-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,3 and 3 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1533-44:
(6*1)+(5*5)+(4*3)+(3*3)+(2*4)+(1*4)=64
64 % 10 = 4
So 1533-44-4 is a valid CAS Registry Number.

1533-44-4Relevant articles and documents

Eine einfache Methode zur Herstellung von Benzoxazolen

Seha, Zdenek,Weis, Claus D

, p. 413 - 419 (2007/10/02)

The preparation of benzoxazoles by a facile one-pot reaction is reported.The reaction of carboxylic acids with 2-chloro-N-methyl-Δ1-pyrrolinium chloride in an excess of N-methyl-2-pyrrolidone afforded carboxylic acid chlorides which were converted subsequently to their 2-hydroxyanilides by addition of 2-aminophenols.Cyclization of the 2-hydroxy-anilides at elevated temperatures furnished the benzoxazoles in high yield and purity.

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