195990-31-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 195990-31-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,9,9 and 0 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 195990-31:
(8*1)+(7*9)+(6*5)+(5*9)+(4*9)+(3*0)+(2*3)+(1*1)=189
189 % 10 = 9
So 195990-31-9 is a valid CAS Registry Number.
195990-31-9Relevant articles and documents
Preparation of sterically constrained arylalkyne oligomers
Crisp, Geoffrey T.,Bubner, Timothy P.
, p. 11899 - 11912 (2007/10/03)
The preparation and physical properties of a series of dioxapropylphenylethynylene oligomers is described. Restricting the interannular rotation narrows the lowest energy absorption and increases its extinction coefficient in the UV/VIS spectrum. The fluo
