138313-83-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138313-83-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,3,1 and 3 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 138313-83:
(8*1)+(7*3)+(6*8)+(5*3)+(4*1)+(3*3)+(2*8)+(1*3)=124
124 % 10 = 4
So 138313-83-4 is a valid CAS Registry Number.
138313-83-4Relevant articles and documents
A Facile Synthesis of Benzopyranopyridin-5-ones
Ivanov, Ivo C.,Karagiosov, Stoyan K.,Simeonov, Mario F.
, p. 203 - 208 (2007/10/02)
The title compounds 5a-c and 7a-m have been prepared by Vilsmeier formylation of 4-aminocoumarins 1 yielding aldehydes 2, and subsequent condensation of 2 with C-H acids in the presence of piperidine.This condensation probably proceeds via the intermediat