497957-92-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 497957-92-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,9,7,9,5 and 7 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 497957-92:
(8*4)+(7*9)+(6*7)+(5*9)+(4*5)+(3*7)+(2*9)+(1*2)=243
243 % 10 = 3
So 497957-92-3 is a valid CAS Registry Number.
497957-92-3Relevant articles and documents
The synthesis and molecular structures of 2,5-diarylpyrroles, [pyr Ar2]H (Ar = Ph, 2,4-xyl)
Tanski, Joseph M.,Parkin, Gerard
, p. 185 - 190 (2002)
2,5-Di(2,4-xylyl)pyrrole, [pyr2,5-Xyl2]H, has been synthesized by reaction of the diketone [XylC(O)CH2]2 with NH 4OAc in AcOH; the diketone itself is obtained by condensation of XylC(O)Me with XylC(O)CH2/s