21108-93-0 Usage
Chemical composition
1H-imidazole-1-sulfonic acid and 1H-imidazole present in equimolar amounts.
Structure
Five-membered heterocyclic ring containing nitrogen.
Derivative
1H-imidazole-1-sulfonic acid is a sulfonic acid derivative of imidazole.
Usage in organic synthesis
1H-imidazole-1-sulfonic acid is commonly used as a building block for various pharmaceuticals and agrochemicals.
Aromatic compound
1H-imidazole is a heterocyclic aromatic organic compound.
Precursor
1H-imidazole serves as a precursor to many pharmaceuticals.
Diverse applications
1H-imidazole is used as a corrosion inhibitor, photographic chemical, and intermediate in the production of adhesives and coatings.
Check Digit Verification of cas no
The CAS Registry Mumber 21108-93-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,0 and 8 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21108-93:
(7*2)+(6*1)+(5*1)+(4*0)+(3*8)+(2*9)+(1*3)=70
70 % 10 = 0
So 21108-93-0 is a valid CAS Registry Number.
21108-93-0Relevant articles and documents
The Stoichiometry in the Determination of Water Using Karl Fischer Reagent
Fischer, Wolfgang,Krenn, Karl-Dieter
, p. 569 - 577 (2007/10/03)
The stoichiometry of the Karl Fischer reaction is not unambiguous. The titer of a Karl Fischer solution rises with the amount of water, because sulphur trioxide which is formed as an intermediate consumes water too. An 1:1-stoichiometry (H2O:I2) can be simulated by alcohols, because these solvents also react with iodine and sulphur dioxide leading to additional consumption of iodine during the titration. This interpretation of the results of Karl Fischer titrations is supported by the isolation or identification of pertinent reaction products.
