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6457-67-6

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6457-67-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 6457-67-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,4,5 and 7 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 6457-67:
(6*6)+(5*4)+(4*5)+(3*7)+(2*6)+(1*7)=116
116 % 10 = 6
So 6457-67-6 is a valid CAS Registry Number.

6457-67-6Relevant articles and documents

The Pyridine-catalysed Reaction of Methanol with Phenyl Isocyanate in Tetrachloromethane

Moodie, Roy B.,Sansom, Peter J.

, p. 664 - 669 (2007/10/02)

The title reaction is first order in catalyst and each reactant.Several 3- and 4-substituted pyridine catalysts generate a Broensted plot with slope β of 0.49.This, the steric effect of 2,4,6-trimethylpyridine, the deuterium isotope effect, and the solvent effect are consistent with the general base mechanism of catalysis.The nucleophilic mechanism is considered relatively unlikely. 2-Pyridylmethanol reacts with phenyl isocyanate faster than does 4-pyridilmethanol, indicating intramolecular general base catalysis in the former case.

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