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156639-47-3

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156639-47-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156639-47-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,6,3 and 9 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 156639-47:
(8*1)+(7*5)+(6*6)+(5*6)+(4*3)+(3*9)+(2*4)+(1*7)=163
163 % 10 = 3
So 156639-47-3 is a valid CAS Registry Number.

156639-47-3Relevant articles and documents

PROCESS FOR SYNTHESIZING POLYHALOGENATED PERHALOALKYLANILINE COMPOUNDS

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Page/Page column 15, (2011/06/16)

A process for preparing polyhalogenated perfluoroalkylanilines particularly useful as reaction intermediates for preparing agrochemicals is disclosed The process comprises reacting anhydrous monomethylamine with 3,4-dichlorobenzot?fluo?de at a temperature of 140-200 °C, halogenating the resultant intermediate with halogenating agents like chloride, sulfuryl chloride and PC15, and then dealkylating the deactivated aniline with catalytic quantity of pyridine salt and dry HC1 gas at 180-190 °C or with anhydrous hydrobromic acid to get 2,6-dichloro-4-trifluoromethylaniline.

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