21663-15-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21663-15-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,6 and 3 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21663-15:
(7*2)+(6*1)+(5*6)+(4*6)+(3*3)+(2*1)+(1*5)=90
90 % 10 = 0
So 21663-15-0 is a valid CAS Registry Number.
21663-15-0Relevant articles and documents
PROCESS FOR SYNTHESIZING KETO-BENZOFURAN DERIVATIVES
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Paragraph 0277, (2014/02/16)
The invention relates to a process for synthesizing benzofuran derivatives, in particular dronedarone of formula (D), comprising a step of Friedel-Crafts acylation starting from a sulfonamido-benzofuran ester intermediate.
