57664-48-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 57664-48-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,6,6 and 4 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 57664-48:
(7*5)+(6*7)+(5*6)+(4*6)+(3*4)+(2*4)+(1*8)=159
159 % 10 = 9
So 57664-48-9 is a valid CAS Registry Number.
57664-48-9Relevant academic research and scientific papers
A Convenient Synthesis of 2-Aryl-3-aroylbenzofurans
Durani, N.,Kapil, R. S.
, p. 489 - 490 (2007/10/02)
The rearrangement of 2-(p-hydroxy)phenyl-3-phenylbenzopyrylium chloride (1), catalysed by H2O2/H2SO4, furnishes 2-(p-hydroxy)phenyl-3-benzoylbenzofuran (2) which is methylated to 3, and then subjected to acid catalysed rearrangement to afford 4.The