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2844214 
Journal Article 
Mono- and dinitration of pentafluorosulfanylbenzenes with [NO2][BF4], and substrate selectivity (PhSF5 vs PhCF3 and PhSF5 vs PhNO2) in competitive nitration 
Okazaki, T; Laali, KK 
2014 
Yes 
Journal of Fluorine Chemistry
ISSN: 0022-1139
EISSN: 1873-3328 
165 
96-100 
English 
PhSF5 1 reacts with NO2+BF4-/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 degrees C. The p-MeC6H4SF5 is mononitrated at room temperature with NO2+BF4--/DCM and dinitrated with NO2+BF4-/TfOH. Substrate selectivity (k(PhSF5)/k(RPh)) in competitive nitration for PhSF5/PhCF3 and PhSF5/PhNO2 with NO2+BF4- in DCM at room temperature was determined at 21.3 and similar to 1 respectively. Relative stability of the corresponding benzenium ions were gauged by DFT from the isodesmic proton transfer reaction SF5-C6H6+ + R-C6H5 -> SF5-C6H5 + R-C6H6+ (R = CF3 and NO2). These studies indicate that reactivity of ArSF5 in SEAr is similar to ArNO2. (C) 2014 Elsevier B.V. All rights reserved. 
SF5-aromatics; Mono- and dinitration; NO2+BF4-/TfOH; Competitive nitration; Substrate selectivity; Isodesmic proton transfer