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153953-01-6

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153953-01-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 153953-01-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,3,9,5 and 3 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 153953-01:
(8*1)+(7*5)+(6*3)+(5*9)+(4*5)+(3*3)+(2*0)+(1*1)=136
136 % 10 = 6
So 153953-01-6 is a valid CAS Registry Number.

153953-01-6Relevant articles and documents

Process for the preparation of imidazopyridines

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, (2008/06/13)

The invention relates to a novel process for the preparation of imidazopyridines of formula I: STR1 in which R is an alkyl having 1-6 C atoms, characterized in that 3,4-diamino-2-chloropyridine (II) is reacted with an acid anhydride of the formula RCO--O--COR 40 (III), in which R is as defined and R' is R or can be another aliphatic or aromatic radical, to give a 4-amino-2-chloro-3-R-CO-aminopyridine (IV), this is converted with 4'-bromomethyl-2-cyanobiphenyl (V), in the presence of an alkali metal alcoholate in an inert solvent, to a 4-amino-2-chloro-3-R-CO-[N-(2'-cyano-biphenyl-4-ylmethyl)-amino]pyridine (VI) and this is treated with a strong acid, a 2-R-4-chloro-3-(2'-cyano-biphenyl-4-ylmethyl)-3H-imidazo[4,5-c]pyridine (VII) being formed as an intermediate.

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