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40643-18-3

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40643-18-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40643-18-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,6,4 and 3 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 40643-18:
(7*4)+(6*0)+(5*6)+(4*4)+(3*3)+(2*1)+(1*8)=93
93 % 10 = 3
So 40643-18-3 is a valid CAS Registry Number.

40643-18-3Downstream Products

40643-18-3Relevant articles and documents

A Keggin heteropoly acid as an efficient catalyst for an expeditious, one-pot synthesis of 1-methyl-2-(hetero)arylbenzimidazoles

Chakrabarty, Manas,Mukherji, Ajanta,Mukherjee, Ratna,Arima, Shiho,Harigaya, Yoshihiro

, p. 5239 - 5242 (2007)

The Keggin heteropoly acid, silicotungstic acid, H4SiW12O40, has been demonstrated to be highly efficient for an expeditious, one-pot synthesis of 1-methyl-2-(hetero)arylbenzimidazoles from N-methyl-1,2-phenylenediamine and (hetero)aryl aldehydes in ethyl acetate at room temperature. The catalyst works equally well for N-phenyl-1,2-phenylenediamine.

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