40441-52-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 40441-52-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,4,4 and 1 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 40441-52:
(7*4)+(6*0)+(5*4)+(4*4)+(3*1)+(2*5)+(1*2)=79
79 % 10 = 9
So 40441-52-9 is a valid CAS Registry Number.
40441-52-9Relevant academic research and scientific papers
A Contribution to Dienone-Phenol Rearrangements
Hagenbruch, Bernd,Huenig, Siegfried
, p. 3884 - 3894 (2007/10/02)
An improved synthesis for dienone 1a and new synthesis for the spirodienones 1b and c are submitted.Whereas 1a is stable in trifluoroacetic acid, 1b and c rearrange to form the dienones 13b and c.Only 13c is further transformed into the stable product phe
