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71527-66-7

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71527-66-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 71527-66-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,5,2 and 7 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 71527-66:
(7*7)+(6*1)+(5*5)+(4*2)+(3*7)+(2*6)+(1*6)=127
127 % 10 = 7
So 71527-66-7 is a valid CAS Registry Number.

71527-66-7Downstream Products

71527-66-7Relevant articles and documents

Process for preparing esters of 3,5,6-trichlorosalicyclic acid

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, (2008/06/13)

An improved process for the synthesis of esters of 3,5,6-trichlorosalicylic acid in quantitative yield comprises reacting the acid with an alcohol under distillation conditions in the presence of a titanium ester or chelate catalyst, whereby byproduct ether formation from the alcohol is suppressed. The process is especially applicable to a process by which salicylic acid is chlorinated first in concentrated sulfuric acid and then with iodine catalyst to make the trichlorosalicylic acid which is extracted and then reacted with an alcohol and a titanium catalyst to make the ester.

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