121756-45-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 121756-45-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,7,5 and 6 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 121756-45:
(8*1)+(7*2)+(6*1)+(5*7)+(4*5)+(3*6)+(2*4)+(1*5)=114
114 % 10 = 4
So 121756-45-4 is a valid CAS Registry Number.
121756-45-4Relevant academic research and scientific papers
A Flexible Synthesis of Methyl 4-Oxobutanoates and Their Derivatives
Kunz, Thomas,Janowitz, Agnes,Reissig, Hans-Ulrich
, p. 43 - 47 (2007/10/02)
Ring cleavage of several methyl 2-trimethylsiloxycyclopropanecarboxylates 3 provides rather sensitive methyl 4-oxobutanoates (β-formyl esters) 4 in excellent yields.Siloxycyclopropanes 3 are easily available either directly from the corresponding silyl en
