81640-72-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81640-72-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,4 and 0 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 81640-72:
(7*8)+(6*1)+(5*6)+(4*4)+(3*0)+(2*7)+(1*2)=124
124 % 10 = 4
So 81640-72-4 is a valid CAS Registry Number.
81640-72-4Relevant academic research and scientific papers
Reactions of Five-membered Heteroaromatic Oxonium Cations with Amines
Katritzky, Alan R.,Zia, Abid
, p. 131 - 136 (2007/10/02)
The reactions of oxazolium, 1,3,4-oxadiazolium, 2-phenyloxazolopyridinium, oxathiolium, and thiazolium cations with primary amines are described.Ring-opening and reclosure to the corresponding azolium cations occur: in some cases open-chain or cycl
