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2,8-Difluoro-5-(trifluoromethyl)-5H-dibenzo[b,d]thiophen-5-ium Trifluoromethanesulfonate
(CAS RN:1961266-44-3 Product Number:D5335)


2,8-Difluoro-5-(trifluoromethyl)-5H-dibenzo[b,d]thiophen-5-ium Trifluoromethanesulfonate
Synonym 2,8-Difluoro-5-(trifluoromethyl)-5H-dibenzo[b,d]thiophen-5-ium Triflate
Synonym Umemoto's Reagent II

General Information

Product Number D5335

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Purity/Analysis Method >98.0%(HPLC)
Storage Temperature
M.F. / M.W. C14H6F8O3S2=438.31
CAS RN 1961266-44-3
Related CAS RN
MDL Number
Packaging and Container
  • Product Details
  • Safety & Regulations


Purity(HPLC) min. 98.0 area%
Purity(Ion exchange titration) min. 97.0 %


PubChem SID 354334398


Signal Word Warning
Hazard Statements
  • H315
  • :Causes skin irritation.
  • H319
  • :Causes serious eye irritation.
Precautionary Statements
  • P264
  • :Wash hands and face thoroughly after handling.
  • P280
  • :Wear protective gloves, eye protection.
  • P302+P352+P332+P313+P362+P364
  • :IF ON SKIN: Wash with plenty of water. If skin irritation occurs: Get medical advice or attention. Take off contaminated clothing and wash it before reuse.
  • P305+P351+P338+P337+P313
  • :IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists: Get medical advice or attention.

Transport Information

HS Number 2934999090


Umemoto’s Reagent II : A Powerful and Thermally Stable Trifluoromethylating Agent



Trifluoromethylation of 1,3-Dicarbonyl Compounds

Trifluoromethylation of the 1,3-dicarbonyl compound: To a DMF (10 mL) solution of 1 (1 mmol), potassium carbonate (3 mmol) and tetrabutylammonium iodide (0.05 mmol) is added Umemoto’s reagent II (1.5 mmol) at room temperature, and the mixture is stirred at room temperature for 3 h. The reaction solution is poured into water (30mL) and extracted with ethyl acetate (30mL x 3). The combined organic layer is dried over MgSO4. After concentration under reduced pressure, the residue is purified with silica gel column chromatography to give 2 (234 mg, 91% yield).


  • Halogenated S-(perfluoroalkyl) dibenzothiophenium salt and its production methods
    • T. Umemoto, B. Zhang, T. Zhu, X. Zhou, Y. Li, PCT Int. Appl. WO 2016107578, 2016.

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