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128403-23-6

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128403-23-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128403-23-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,4,0 and 3 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 128403-23:
(8*1)+(7*2)+(6*8)+(5*4)+(4*0)+(3*3)+(2*2)+(1*3)=106
106 % 10 = 6
So 128403-23-6 is a valid CAS Registry Number.

128403-23-6Relevant articles and documents

Addition of nitroalkanes toortho-halonitrobenzenes: A new synthesis of 4-chloro-7-(trifluoromethyl)quinoline

Gregory Reid,Reny Runge, Jean H.

, p. 1093 - 1096 (2007/10/02)

Base-mediated reaction of ortho-nitroaryl chlorides and fluorides with nitroalkanes followed by an oxidative Nef reaction provides aryl ketones. With this simple procedure, methylketone 6 was prepared in 91% yield. 6 was then converted in three steps (60-65% yield) to 4-chloro-7-(trifluoromethyl)quinoline (2), an intermediate in the synthesis of the antihypertensive agent losulazine (U-54,669, 1).

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