139435-21-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139435-21-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,4,3 and 5 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 139435-21:
(8*1)+(7*3)+(6*9)+(5*4)+(4*3)+(3*5)+(2*2)+(1*1)=135
135 % 10 = 5
So 139435-21-5 is a valid CAS Registry Number.
139435-21-5Relevant articles and documents
1,3,4-THIADIAZOLES FROM THIOSEMICARBAZIDES
Scovill, John P.,Klayman, Daniel L.,Flippen-Anderson, Judith L.,Gilardi, Richard
, p. 273 - 281 (2007/10/02)
A new method for the synthesis of 1,3,4-thiadiazoles is described.Thus condensation of 4-methyl-4-phenyl-3-thiosemicarbazide with an aldehyde or ketone affords 1,1-disubstituted-6--2,5-dithiobiureas, rather than the anticipated 4,