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405201-28-7

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405201-28-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 405201-28-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,5,2,0 and 1 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 405201-28:
(8*4)+(7*0)+(6*5)+(5*2)+(4*0)+(3*1)+(2*2)+(1*8)=87
87 % 10 = 7
So 405201-28-7 is a valid CAS Registry Number.

405201-28-7Relevant articles and documents

A facile synthesis of 7,8-di aryl coumarino and flavano benzo-thiophenes

Chandramouli,Prasanna,Naveen Kumar,Vijayakumar Reddy

, p. 511 - 522 (2007/10/03)

The key step for the synthesis of 7-hydroxy 2,3-diarylsubstituted benzothiophenes 5a-f, by starting from substituted 2-aryl-2-((2-methoxy phenyl)thio)acetophenones 3a-f as an intermediate, consists of a Friedel-Crafts cyclization followed by demethylation by Lewis acids like BF3OEt2 and AlCl3 in DCM.

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