293758-43-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 293758-43-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,9,3,7,5 and 8 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 293758-43:
(8*2)+(7*9)+(6*3)+(5*7)+(4*5)+(3*8)+(2*4)+(1*3)=187
187 % 10 = 7
So 293758-43-7 is a valid CAS Registry Number.
293758-43-7Relevant academic research and scientific papers
Synthesis of new sulfonyl chlorides on the basis of substituted diphenyl sulfones
Yablonskii,Tarasov,Moskvichev
, p. 60 - 63 (2007/10/03)
-Sulfonation of substituted diphenyl sulfones with excess chlorosulfonic acid at 100°C yields as a rule the corresponding bis-sulfonyl chlorides. The reaction with an equimolar amount of 20% oleum yields products of sulfonation of only one benzene ring.
