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21920-68-3

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21920-68-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21920-68-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,2 and 0 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21920-68:
(7*2)+(6*1)+(5*9)+(4*2)+(3*0)+(2*6)+(1*8)=93
93 % 10 = 3
So 21920-68-3 is a valid CAS Registry Number.

21920-68-3Relevant articles and documents

Reactions of 3,5-di-tert-Butyl-4-hydroxybenzyl Acetate with Weakly Basic Nucleophiles

Bukharov,Nugumanova,Mukmeneva

, p. 408 - 412 (2003)

The acid dissociation of 3,5-di-tert-butyl-4-hydroxybenzyl acetate in the presence of bases or in dimethylformamide favors reaction of this compound with weakly basic nucleophilies.

Method of preparing phenolic antioxidants by condensing active methylene compounds with 3,5-di-tert alkyl-4-hydroxybenzylpyridinium salts

-

, (2008/06/13)

3,5-Di-tert alkyl-4-hydroxybenzylpyridinium salts are reacted under basic conditions with compounds containing active methylene groups to form phenolic antioxidants. For example, 3,5-di-tert.butyl-4-hydroxybenzylpyridinium chloride is reacted with 2-nitro

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