2,3,7,8-Tetrafluoro-5-(trifluoromethyl)-5H-dibenzo[b,d]thiophen-5-ium Tetrafluoroborate(Novel Umemoto's Reagent III) is a powerful, thermally stable, one-pot-preparable and recyclable reagent for electrophilic trifluoromethylation and trifluoromethylthiolation with various types of nucleophilic substrates, such as carbanions, (hetero)aromatics, alkenes, alkynes, thiols, sulfinates, and phosphines.
S-(Trifluoromethyl)dibenzothiophenium salts, known as Umemoto's reagents, have two significant drawbacks that have hampered their practical application: (1) synthesis involving many steps and (2) the formation of large amounts of dibenzothiophene as waste after trifluoromethylation. New Umemoto's reagents are developped by substituting fluorine at specific positions on the dibenzothiophenium rings has resulted in massive improvements in the synthesis, properties, reactivity, and applications of these compounds.
Powerful, Thermally Stable, One-Pot-Preparable, and Recyclable Electrophilic Trifluoromethylating Agents: 2,8-Difluoro- and 2,3,7,8-Tetrafluoro-S-(trifluoromethyl)dibenzothiophenium Salts. 
 T. Umemoto, B. Zhang, T. Zhu, X. Zhou, P. Zhang, S. Hu, Y. Li, J. Org. Chem., 2017, 82(15), pp 7708-7719.
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NONH for all modes of transport
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