121017-34-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 121017-34-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,0,1 and 7 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 121017-34:
(8*1)+(7*2)+(6*1)+(5*0)+(4*1)+(3*7)+(2*3)+(1*4)=63
63 % 10 = 3
So 121017-34-3 is a valid CAS Registry Number.
121017-34-3Relevant articles and documents
2,6-Epoxy-3-benzoxocin-4-ol Derivatives by Double Intramolecular Formation of Hemiacetals
Wuensch, Bernhard,Bauschke, Gerd
, p. 59 - 65 (2007/10/02)
With dilute HCl the hydroxydialdehyde derivatives 10a-c are cyclised to give the tricyclic hemiacetals 6a-c.This double intramolecular formation of hemiacetals succeeds well, if R in 10 is not hydrogen; if R = H an equilibrium between 5a and 6a is observe