138055-97-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138055-97-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,0,5 and 5 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 138055-97:
(8*1)+(7*3)+(6*8)+(5*0)+(4*5)+(3*5)+(2*9)+(1*7)=137
137 % 10 = 7
So 138055-97-7 is a valid CAS Registry Number.
138055-97-7Relevant articles and documents
Synthesis of 2(1H)-pyridones from 2H-pyran-2-ones
Kvita
, p. 883 - 884 (2007/10/02)
5-Substituted and 4,5-disubstituted 2(1H)-pyridones (13 examples) with formyl, acyl, alkoxycarbonyl, and trifluoromethyl groups in the 5 position were prepared in 16-97% yield by amination of the corresponding 2H-pyran-2-ones with hexamethyldisilazane or alkyl(trimethylsilyl)amines.