940877-21-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 940877-21-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,4,0,8,7 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 940877-21:
(8*9)+(7*4)+(6*0)+(5*8)+(4*7)+(3*7)+(2*2)+(1*1)=194
194 % 10 = 4
So 940877-21-4 is a valid CAS Registry Number.
940877-21-4Relevant articles and documents
A new construction of 2-alkoxypyrans by an acylation-reductive cyclization sequence
Heumann, Lars V.,Keck, Gary E.
, p. 1951 - 1954 (2008/02/02)
A new convergent synthetic approach to a pyran motif common to many naturally occurring structures is described. In this approach, two fragments are joined by esterification, and a subsequent intramolecular reductive cyclization affords the 2-hydroxypyran.