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143741-85-9

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143741-85-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 143741-85-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,7,4 and 1 respectively; the second part has 2 digits, 8 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 143741-85:
(8*1)+(7*4)+(6*3)+(5*7)+(4*4)+(3*1)+(2*8)+(1*5)=129
129 % 10 = 9
So 143741-85-9 is a valid CAS Registry Number.

143741-85-9Relevant articles and documents

Saccharin sulfonic acid catalyzed N-Boc protection of amines and formation of tertbutyl ethers from alcohols

Shirini,Zolfigol,AbediniM.

, p. 603 - 607 (2010)

Saccharin sulfonic acid (SaSA), as a stable reagent is easily prepared by the reaction of saccharin with neat chlorosulfonic acid at room temperature. This compound is able to catalyze conversion of amines to their corresponding N-Boc protected amines with (Boc)2O. Alcohols were also converted to their corresponding tert-butyl ethers. All reactions took place under mild conditions giving the desired products in good to high yields.

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