221021-20-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221021-20-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,0,2 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 221021-20:
(8*2)+(7*2)+(6*1)+(5*0)+(4*2)+(3*1)+(2*2)+(1*0)=51
51 % 10 = 1
So 221021-20-1 is a valid CAS Registry Number.
221021-20-1Relevant articles and documents
Synthesis of benzofuranones related to diazonamide via an intramolecular pummerer reaction
Magnus, Philip,Kreisberg, Jennifer D.
, p. 451 - 454 (2007/10/03)
Treatment of in situ generated 2-thiomethyl-2-chloro-2-phenylacetyl aryl esters with SnCl4 (catalytic) resulted in the formation of the corresponding 3-thiomethylbenzofuran-2-ones.
