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34454-33-6

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34454-33-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 34454-33-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,4,4,5 and 4 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 34454-33:
(7*3)+(6*4)+(5*4)+(4*5)+(3*4)+(2*3)+(1*3)=106
106 % 10 = 6
So 34454-33-6 is a valid CAS Registry Number.

34454-33-6Relevant articles and documents

Process for the preparation of aromatic dicarboxylic acids and aromatic hydrocarbons

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, (2008/06/13)

Aromatic dicarboxylic acids of the formula STR1 in which R1, R2, m, n, and X have the meaning mentioned in the description, can be prepared from the bisphenols, on which they are based, of the formula STR2 if the bisphenols are first reacted to give the bissulphonates, the sulphonate groups are removed catalytically with H2 and the hydrocarbons obtained in this way are doubly acylated in a known manner and the acyl groups are oxidized to the carboxyl groups. Many of the aromatic dicarboxylic acids which can be prepared in this way are new.

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