557762-65-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 557762-65-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,7,7,6 and 2 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 557762-65:
(8*5)+(7*5)+(6*7)+(5*7)+(4*6)+(3*2)+(2*6)+(1*5)=199
199 % 10 = 9
So 557762-65-9 is a valid CAS Registry Number.
557762-65-9Relevant academic research and scientific papers
A facile access to 2-ethynyl-1,4-dihydropyridines via Hantzsch three-component reaction
Szemes Jr., Fridrich,Marchalin, Stefan,Pronayova, Nadezda,Daich, Adam
, p. 779 - 783 (2007/10/03)
A new synthesis of 2-ethynyl-1,4-dihydropyridine derivatives in two steps from alkyl 3-oxo-5-trimethylsilyl-4-pentynoates via the Hantzsch three-component reaction followed by an alkaline hydrolysis is described.
