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51806-71-4

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51806-71-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 51806-71-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,8,0 and 6 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 51806-71:
(7*5)+(6*1)+(5*8)+(4*0)+(3*6)+(2*7)+(1*1)=114
114 % 10 = 4
So 51806-71-4 is a valid CAS Registry Number.

51806-71-4Relevant articles and documents

β-Hydroxyalkylation of sterically hindered phenols with epoxides in acid medium

Krysin,Amitina,Egorova,Vasiliev

experimental part, p. 354 - 360 (2011/06/27)

Reactions of 2,6-dialkylphenols with ethylene oxide, propylene oxide and epichlorohydrin in the presence of SnCl4 at the temperature from -5 to +5°C leads to the formation of respective phenols containing a hydroxy group in the β-position of the aliphatic chain of the para-substituent. The conditions for maximum selectivity of the reaction of 2,6-di-tert-butylphenol with ethylene oxide were determined. By HPLC-MS method the directions of the side reactions were explored. The method has been successfully tested in a pilot installation. With 2,6-dimethylphenol instead of 2,6-di-tert-butylphenol a sharp increase occurs in the content of ethers in the reaction product. With epichlorohydrin, 2,6-di-tert-butylphenol affords a product, which is easily converted into an epoxide containing a sterically hindered phenol in its structure.

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