216988-54-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 216988-54-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,6,9,8 and 8 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 216988-54:
(8*2)+(7*1)+(6*6)+(5*9)+(4*8)+(3*8)+(2*5)+(1*4)=174
174 % 10 = 4
So 216988-54-4 is a valid CAS Registry Number.
216988-54-4Relevant articles and documents
5-Endo-dig cyclisations of homopropargylic sulfonamides: A new route to 2,3-dihydropyrroles and β-iodopyrroles
Knight, David W.,Redfern, Adele L.,Gilmore, Jeremy
, p. 2207 - 2208 (1998)
5-endo-dig Iodocyclisations of the homopropargylic sulfonamides 12a-c and 13 give excellent yields of the iododihydropyrroles 14a-d and thence the β-iodopyrroles 15a-d, following base-catalysed elimination of sulfinic acid.
