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1621957-58-1

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1621957-58-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1621957-58-1 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 8 respectively.
Calculate Digit Verification of CAS Registry Number 1621957-58:
(9*1)+(8*6)+(7*2)+(6*1)+(5*9)+(4*5)+(3*7)+(2*5)+(1*8)=181
181 % 10 = 1
So 1621957-58-1 is a valid CAS Registry Number.

1621957-58-1Downstream Products

1621957-58-1Relevant articles and documents

Mono- and dinitration of pentafluorosulfanylbenzenes with [NO 2][BF4], and substrate selectivity (PhSF5 vs PhCF3 and PhSF5 vs PhNO2) in competitive nitration

Okazaki, Takao,Laali, Kenneth K.

, p. 96 - 100 (2014)

PhSF5 1 reacts with NO2+BF 4-/TfOH in CH2Cl2 (DCM) at room temperature to give 1-nitro-3-(pentafluorosulfanyl)benzene 2 in near quantitative yield. The dinitro derivative 4 is synthesized from 2 by reaction with NO2+BF4-/TfOH at 70 °C. The p-MeC6H4SF5 is mononitrated at room temperature with NO2+BF4-/DCM and dinitrated with NO2+BF4-/TfOH. Substrate selectivity (kPhSF5kRPh) in competitive nitration for PhSF5/PhCF3 and PhSF5/PhNO 2 with NO2+BF4- in DCM at room temperature was determined at 21.3 and ~1 respectively. Relative stability of the corresponding benzenium ions were gauged by DFT from the isodesmic proton transfer reaction SF5-C6H 6+ + R-C6H5 → SF 5-C6H5 + R-C6H6 + (R = CF3 and NO2). These studies indicate that reactivity of ArSF5 in SEAr is similar to ArNO 2.

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