139740-83-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139740-83-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,7,4 and 0 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 139740-83:
(8*1)+(7*3)+(6*9)+(5*7)+(4*4)+(3*0)+(2*8)+(1*3)=153
153 % 10 = 3
So 139740-83-3 is a valid CAS Registry Number.
139740-83-3Relevant academic research and scientific papers
A convenient synthesis of diethyl 2,4-dioxoalkylphosphonates
Fouque,About-Jaudet,Collignon,Savignac
, p. 219 - 228 (2007/10/02)
Diethyl 2,4-dioxoalkylphosphonates are prepared in excellent yields by Claisen condensation of the dianion of diethyl 2-oxoalkylphosphonates with ethyl esters or acyl chlorides in the presence of one equivalent of lithium diisopropylamide (LDA).
