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1621957-56-9

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1621957-56-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1621957-56-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,2,1,9,5 and 7 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1621957-56:
(9*1)+(8*6)+(7*2)+(6*1)+(5*9)+(4*5)+(3*7)+(2*5)+(1*6)=179
179 % 10 = 9
So 1621957-56-9 is a valid CAS Registry Number.

1621957-56-9Downstream Products

1621957-56-9Relevant articles and documents

Synthesis of 4-(pentafluorosulfanyl)benzenediazonium tetrafluoroborate and analogs and their application for the preparation of SF5-aromatics

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Page/Page column 11; 12, (2016/02/05)

4-(pentafluorosulfanyl)benzenediazonium tetrafluoroborate salt was synthesized and isolated. The pentafluorosulfanyl salt was examined in a wide assortment of reactions to form novel SF5-bearing alkenes, alkynes, and biaryl derivatives using Heck-Matsuda, Sonogashira, and Suzuki coupling protocols. Dediazoniation of the salt furnished the corresponding p-SF5—C6H4X,C6H4OS(O)(CF3)═NSO2CF3, and p-SF5—C6H4-NTf2 derivatives. The azide derivative p-SF5—C6H4N3 entered into click chemistry with phenylacetylenes to furnish the corresponding triazoles. Various SF5-bearing alkenes were synthesized by coupling reactions using a metal catalyst. Fluorodediazoniation selectively furnished the fluoro derivative p-SF5—C6H4F. Homolytic dediazoniation gave the unsymmetrical biaryls, thus demonstrating the broad utility of pentafluorosulfanyl diazonium salts as building blocks of SF5-aromatics that are in high demand in many branches of chemistry including biomedicine and materials chemistry.

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