83731-13-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 83731-13-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,7,3 and 1 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 83731-13:
(7*8)+(6*3)+(5*7)+(4*3)+(3*1)+(2*1)+(1*3)=129
129 % 10 = 9
So 83731-13-9 is a valid CAS Registry Number.
83731-13-9Relevant academic research and scientific papers
Tandem Cope-Claisen Rearrangement: Scope and Stereochemistry
Ziegler, Frederick E.,Piwinski, John J.
, p. 7181 - 7190 (2007/10/02)
The complete details of the seminal study on the tandem Cope-Claisen rearrangement are presented.The reaction uses an initial Cope rearrangement to trigger an irreversible Claisen rearrangement.In several cases, the Claisen step drives an unfavorable Cope
