177972-56-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 177972-56-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,7,9,7 and 2 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 177972-56:
(8*1)+(7*7)+(6*7)+(5*9)+(4*7)+(3*2)+(2*5)+(1*6)=194
194 % 10 = 4
So 177972-56-4 is a valid CAS Registry Number.
177972-56-4Relevant articles and documents
A new, highly stereoselective approach to pyrrolidines via overall 5-endo-trig cyclisations of homoallylic tosylamides
Jones, Andrew D.,Knight, David W.
, p. 915 - 916 (2007/10/03)
Iodocyclisations of E-homoallylic tosylamides 7 lead to excellent yields of either 2,5-trans- or 2,5-cis-3-iodopyrrolidines (10 or 11), depending upon the reaction conditions.
