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552322-79-9

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552322-79-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 552322-79-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,2,3,2 and 2 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 552322-79:
(8*5)+(7*5)+(6*2)+(5*3)+(4*2)+(3*2)+(2*7)+(1*9)=139
139 % 10 = 9
So 552322-79-9 is a valid CAS Registry Number.

552322-79-9Downstream Products

552322-79-9Relevant articles and documents

3-Fluoropyridyl nickel complexes as useful tools for the selective synthesis of new 2,4,5,6-tetrafluoropyridines: A route complementing the established methods to access fluorinated pyridines

Sladek, Marianna I.,Braun, Thomas,Neumann, Beate,Stammler, Hans-Georg

, p. 313 - 318 (2007/10/03)

Treatment of [Ni(COD)2] with 3-chlorotetrafluoropyridine in the presence of PEt3 or PCy3 effects the formation of the complexes trans-[NiCl(3-C5NF4)(PEt3)2] (1) and trans-[NiCl(3-C5NF4)(PCy3)2] (2), respectively. Reaction of 1 with MeLi gives trans-[NiMe(3-C5NF4)(PEt3)2] (3). Treatment of 3 with air yields 3-methyltetrafluoropyridine. The reaction of 1 with CO affords 1-(2,4,5,6-tetrafluoropyridin-3-yl)ethanone (6), which slowly converts into 1-(2,5,6-trifluoropyridin-3-yl)ethanone (7) in the presence of PEt3. The structure of the complexes 1 and 3 have been determined by X-ray crystallography. The Ni-C distances to the pyridyl ligand are 1.894(1) and 1.936(2) A, respectively. The Ni-C bond length to the methyl group in 3 is 1.991(3) A. The studies reported in this paper demonstrate the synthesis of nickel derivatives of tetrafluoropyridine with the metal in the 3-position as well as the preparation of otherwise not accessible 3-substituted tetrafluoropyridines by C-C coupling reactions.

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