138531-57-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138531-57-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,5,3 and 1 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 138531-57:
(8*1)+(7*3)+(6*8)+(5*5)+(4*3)+(3*1)+(2*5)+(1*7)=134
134 % 10 = 4
So 138531-57-4 is a valid CAS Registry Number.
138531-57-4Relevant academic research and scientific papers
Synthesis of (+/-)-β-cuparenone via 3-oxa-β-cuparenone
Srikrishna, A,Nagaraju, S
, p. 1006 - 1009 (2007/10/02)
Grignard reaction followed by ozonolysis, or ozonolysis followed by Grignard reaction on the pentanoate 8, generates the diol 9.Cyclodehydration of 9 leads to the 3-oxacuparene (6), whereas PCC oxidation furnishes the 3-oxa-β-cuparenone (7).Methanesulfoni
