42957-23-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 42957-23-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,9,5 and 7 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 42957-23:
(7*4)+(6*2)+(5*9)+(4*5)+(3*7)+(2*2)+(1*3)=133
133 % 10 = 3
So 42957-23-3 is a valid CAS Registry Number.
42957-23-3Relevant academic research and scientific papers
A NEW METHOD FOR THE SYNTHESIS OF α,β-UNSATURATED KETONES
Bonadies, Francesco,Scarpati, M. Luisa,Savagnone, Fulvio
, p. 1 - 4 (2007/10/02)
The Zn(2+)-catalyzed selective cleavage of the oxalyl moiety of β-acyl-α-hydroxy-butenolides with various γ substituents affords α,β-unsaturated ketones in satisfactory yields.
